Frequently Asked Questions

1. What is the Projecta PM300 Intelli-RV?

Answer:

The PM300 is an integrated 12V power management system designed for caravans and motorhomes.

It provides:

• Service battery charging from AC mains.
• MPPT solar charging.
• Alternator charging through a voltage charging relay.
• Starter battery maintenance charging.
• Battery voltage, current, remaining capacity and time-to-go monitoring.
• Low-voltage battery protection.
• Control of up to 14 DC outputs.
• Water-pump control.
• Monitoring for up to four water tanks.
• A digital LCD monitor.
• Optional Bluetooth monitoring through a compatible module.

The system includes a master power unit and a separate LCD monitor.

2. What are the main components of the PM300 system?

Answer:

A typical PM300 system includes:

• PM335 master power unit.
• PMLCD monitor.
• Battery temperature sensor.
• Battery-monitoring connection.
• AC mains cable.
• Service battery connection.
• Starter battery connection.
• Solar input.
• Optional outdoor temperature sensor.
• Optional water tank probes.
• Optional remote battery switch.
• Associated communication and sensor cables.

Water tank probes and some accessories may need to be ordered separately.

3. Which charging sources can the PM300 use?

Answer:

The PM300 can accept charging power from:

• 240V AC mains.
• Solar panels.
• The towing vehicle’s starter battery and alternator.

Only one charging source supplies the system at a time.

The priority is:

• When AC mains and solar are available, AC mains has priority.
• When AC mains and vehicle charging are available, AC mains has priority.
• When solar and vehicle charging are available, vehicle charging has priority.

The relevant LED may flash slowly when an input is available but another higher-priority source is being used.

4. Which battery types are supported by the PM300?

Answer:

The PM300 supports the following 12V service battery types:

• AGM.
• GEL.
• WET or flooded lead-acid.
• LFP or LiFePO4 lithium.

The selected battery type must match the battery installed in the caravan.

Incorrect battery settings may result in unsuitable charging voltage, poor battery performance or battery damage.

5. How do I select the battery type?

Answer:

Battery type can be configured using the DIP switches inside the PM335 master unit and through the monitor.

DIP switch settings

• AGM: DS3 OFF and DS4 OFF.
• GEL: DS3 OFF and DS4 ON.
• LFP lithium: DS3 ON and DS4 OFF.
• WET: DS3 ON and DS4 ON.

Charging voltages

AGM

• Absorption: approximately 14.4V.
• Float: approximately 13.5V.

GEL

• Absorption: approximately 14.1V.
• Float: approximately 13.5V.

LFP lithium

• Absorption: approximately 14.4V.
• Float: approximately 13.5V.

WET

• Absorption: approximately 14.7V.
• Float: approximately 13.7V.

The battery type selected on the monitor must match the DIP-switch setting. A battery icon may flash when the settings do not match.

6. How do I set the battery capacity and AC charging current?

Answer:

The PM300 charging current is selected according to the battery capacity.

DIP switch settings

• 50Ah battery: DS1 ON and DS2 ON — 5A charging.
• 100Ah battery: DS1 ON and DS2 OFF — 10A charging.
• 150Ah battery: DS1 OFF and DS2 ON — 15A charging.
• 200Ah battery: DS1 OFF and DS2 OFF — 20A charging.

The battery-capacity setting on the monitor must match the DIP-switch setting.

When selecting the charging current, consider the current being used by appliances connected to the PM300. Available charger output may be shared between charging the battery and supplying connected loads.

7. How does the lithium charging-current setting work?

Answer:

When the PM300 is configured for an LFP or LiFePO4 lithium battery, the maximum charging current is automatically limited according to the selected battery capacity.

The manual specifies a maximum lithium charging current of approximately 30% of the battery capacity.

For example, a battery manufacturer may specify a lower maximum charging current than the PM300 can provide. Always follow the battery manufacturer’s charging limits.

8. What do the PM300 charging stages mean?

Answer:

The PM300 uses a five-stage charging process.

Soft Start
Charging begins gently when the battery voltage is very low.

Bulk
The charger supplies maximum available charging current to increase the battery state of charge.

Absorption
The charger maintains the required charging voltage while the battery completes charging.

Float
The battery is fully charged and maintained at a safe voltage.

Recycle
The charger periodically checks and maintains the battery during long-term connection.

The Float and Recycle stages allow the battery to remain connected to the charger for extended periods.

9. What do the CHG LED indications mean?

Answer:

The green CHG LED indicates the service battery’s operating condition.

• Solid ON: The battery is charged.
• Slow flashing: The battery is charging.
• Quick flashing: The battery is discharging.
• OFF: The service battery is disconnected.

A solid CHG LED generally indicates that the battery has reached the Float stage.

10. Does the PM300 charge the vehicle starter battery?

Answer:

Yes. When AC mains or solar charging is available, the PM300 can provide up to approximately 3A of maintenance charging to the vehicle starter battery.

Maintenance charging normally starts when:

• The starter battery is below approximately 12.4V.
• The condition continues for approximately 30 minutes.

Charging stops when the starter battery reaches approximately 12.8V.

This is intended to maintain the starter battery rather than rapidly recharge a heavily discharged vehicle battery.

11. How does alternator charging work?

Answer:

The PM300 uses a built-in voltage charging relay, described as a VCR or VSR, to connect the service battery to the vehicle charging system.

The relay normally connects when:

• The starter battery reaches approximately 13.4V.
• The voltage remains above the threshold for approximately 10 seconds.

The relay disconnects when:

• The starter battery falls below approximately 12.8V.
• The voltage remains below the threshold for approximately 60 seconds.

The alternator-charging circuit is rated for approximately:

• 60A continuous.
• 100A for up to 30 minutes.

Alternator charging does not use the PM300’s five-stage charging algorithm. The system passes the charging power available from the vehicle alternator.

12. What solar input can be connected to the PM300?

Answer:

The PM300 has a built-in MPPT solar controller.

The main solar limits are:

• Maximum solar open-circuit voltage: 50V DC.
• Maximum solar charging current: 20A.
• Maximum solar supply current: 30A.

The solar array’s open-circuit voltage must remain below 50V under all conditions, including cold weather.

The PV LED will flash quickly if the solar input exceeds approximately 50V.

Solar installation and voltage testing should be completed by a suitably qualified installer.

13. Can the PM300 operate without a service battery?

Answer:

Yes. When no service battery is connected, the PM300 can automatically operate as a power supply.

In power-supply mode, the nominal output is approximately:

• 12.8V DC.
• Up to 35A continuous output.

Some battery-monitoring and battery-dependent functions will not operate normally when no service battery is installed.

14. How does low-voltage battery protection work?

Answer:

The PM300 has built-in low-voltage protection that disconnects controlled loads when the service battery becomes excessively discharged.

Default lead-acid settings

• Disconnect voltage: approximately 10.5V.
• Reconnect voltage: approximately 11.5V.

Default LFP lithium settings

• Disconnect voltage: approximately 11.2V.
• Reconnect voltage: approximately 12.2V.

The default disconnect delay is approximately 60 seconds.

The LOAD button on the monitor can also be used to switch controlled DC loads on or off.

Permanent outputs and loads connected directly to the battery may remain powered after low-voltage protection operates.

15. How does the local and remote battery switch work?

Answer:

The PM300 can be controlled using either:

• The battery switch on the PM335 master unit.
• An optional external remote battery switch.

The selector inside the PM335 must be set correctly.

Local setting

• The switch on the PM335 operates.
• The remote switch is disabled.

Remote setting

• The remote switch operates.
• The switch on the PM335 is disabled.

The battery switch isolates the service battery output when the battery is the only available power source.

If AC mains, solar or vehicle power is available, some system functions may remain active.

16. Why must the battery settings match on the PM335 and monitor?

Answer:

Battery type and battery capacity can be configured in two places:

• The DIP switches inside the PM335 master power unit.
• The PMLCD monitor.

Both settings must match.

When they do not match:

• The battery-type or capacity icons may flash.
• Charging-current selection may be unclear.
• Battery monitoring may be inaccurate.
• The wrong charging profile may be applied.

Check both settings after replacing the battery, resetting the system or changing battery chemistry.

17. What does the PM300 monitor display?

Answer:

The monitor can display:

• Service battery voltage.
• Charging or discharging current.
• Battery state of charge.
• Remaining amp-hours.
• Estimated time remaining.
• Starter battery voltage.
• Solar charging status.
• AC mains status.
• VCR connection status.
• DC load status.
• Water-pump status.
• Water levels for up to four tanks.
• Outdoor or system temperature.
• Alarm and error codes.
• Date and time.
• Battery type and capacity.

The monitor is also used to change battery, pump, low-voltage and system settings.

18. How do I enter the monitor configuration menu?

Answer:

Follow these steps:

1. Press and hold the LIGHT button.
2. Wait until a setting code appears in the date and time area.
3. Use the PUMP button to move upward through the menu.
4. Use the LOAD button to move downward through the menu.
5. Use the LIGHT/ENTER button to select or save a setting.
6. Use the SILENT/ESC button to exit or return.

The configuration menu includes:

• Date and time.
• Battery type.
• Battery capacity.
• Low-voltage protection.
• Water-pump enable or disable.
• Factory reset.
• Software version.
• Bluetooth disconnection.
• Firmware-update enable.

19. How do I turn the water pump on or off?

Answer:

Use the PUMP button on the monitor.

Follow these steps:

1. Press the PUMP button.
2. Check the pump symbol on the display.
3. Confirm the pump symbol changes to ON or OFF.
4. If the pump function has been disabled in the configuration menu, enable Pump 1 first.
5. Check the relevant fuse if the pump does not operate.

The PM300 provides one water-pump output and can monitor up to four water tank probes.

20. What does Silent Mode do?

Answer:

Silent Mode reduces system noise.

When Silent Mode is active:

• The monitor backlight may turn off or reduce.
• The cooling fan turns off or operates at a lower speed.

To activate Silent Mode:

1. Press the SILENT button until the Silent symbol appears.
2. Press LIGHT/ENTER to confirm where required.

Charging performance may be reduced if fan speed is restricted by Silent Mode or temperature conditions.

21. Which water tank probes are compatible with the PM300?

Answer:

The PM300 can monitor a maximum of four tank probes.

Compatible probe types include:

PMWS200

• Side installation.
• Suitable for tanks deeper than approximately 200mm.

PMWS400

• Side installation.
• Suitable for tanks approximately 300mm to 400mm deep.

The system can typically be configured for:

• Fresh water tank 1.
• Fresh water tank 2.
• Tap water tank.
• Waste water tank.

Confirm the tank depth and installation requirements before selecting a probe.

22. How are the PM300 DC outputs grouped?

Answer:

The PM300 provides 14 fused DC outputs.

They are divided into categories:

Class A1

• One relay-controlled and fused output.
• Protected by the main battery switch.
• Normally used for the water pump.

Class B

• Ten fused outputs.
• Protected by the main battery switch.
• Suitable for items such as ventilation fans and lighting.

Class C

• Two live outputs.
• Suitable for equipment such as a refrigerator or security alarm.

Class D

• One permanent output.
• Commonly used for an automatic step.

Class C and Class D outputs may remain active when normal controlled loads are switched off.

23. Why can the battery state-of-charge reading be inaccurate?

Answer:

The PM300 calculates battery use through its built-in current-measurement system.

The reading may be inaccurate when:

• Loads are connected directly to the battery.
• Charging sources bypass the PM300 measurement path.
• The configured battery capacity is incorrect.
• The selected battery type is incorrect.
• The battery has not recently received a complete AC charge.
• Battery wiring or sensor connections are incorrect.

Only power consumed through the PM335 is included in the monitor’s calculations.

For accurate readings, route relevant loads through the PM300 and periodically complete a full AC charge.

24. What battery-monitor maintenance is recommended?

Answer:

To maintain accurate battery-monitor readings:

1. Fully charge the battery from AC mains approximately every two weeks.
2. Complete a full AC charge at least once every three months.
3. Continue charging until the CHG LED is solid or FLOAT appears on the monitor.
4. Confirm the battery switch is ON during AC charging.
5. Confirm the service battery is a nominal 12V battery.
6. Complete the maintenance procedure when error code 8018 appears.
7. After maintenance, press the SILENT button for approximately one second to clear the notice.

Maintain adequate ventilation around the master power unit. The manual’s maintenance section recommends approximately 100mm of clearance on each side.

Troubleshooting Questions and Answers

The PM300 uses front-panel LEDs and monitor error codes to identify electrical, charging, temperature, communication and water-tank conditions.

1. Why does the PM300 have no display or no DC output?

Answer:

Check the following:

1. Confirm the service battery is connected.
2. Confirm the battery polarity is correct.
3. Check the service battery voltage.
4. Confirm the battery switch is ON.
5. If a remote switch is installed, confirm the selector is set to Remote.
6. If using the local switch, confirm the selector is set to Local.
7. Confirm the monitor communication cable is connected.
8. Check whether the LOAD function is switched on.
9. Check the master-unit fuses.
10. Check for an active red Fault LED or monitor error code.

If the service battery is below the low-voltage threshold, controlled loads may remain disconnected until the battery is charged above the reconnect voltage.

Arrange technical inspection if the display remains blank after power, battery and communication connections have been checked.

2. Why is the green Mains LED flashing quickly?

Answer:

A quickly flashing Mains LED indicates an abnormal AC input.

Follow these steps:

1. Disconnect the PM300 from AC mains.
2. Inspect the AC lead and plug for visible damage.
3. Check whether the supplying circuit breaker or safety switch has tripped.
4. Confirm the AC supply is approximately 240V and correctly earthed.
5. Reconnect the unit to a known suitable supply.
6. Check whether the Mains LED becomes solid.

Stop using AC charging if the LED continues flashing.

Fixed 240V wiring and repairs must be checked by a licensed electrician.

3. Why is the green PV LED flashing quickly?

Answer:

A quickly flashing PV LED indicates that the solar input voltage is too high.

The PM300 maximum solar open-circuit voltage is approximately 50V DC.

Follow these steps:

1. Isolate the solar panels using the approved isolation method.
2. Do not disconnect live solar connectors under load.
3. Check the solar-array open-circuit voltage.
4. Confirm the panels have not been connected in a series arrangement exceeding 50V.
5. Inspect the solar wiring for incorrect polarity or damaged connections.
6. Have the system checked by a qualified solar or auto-electrical installer.

Error code 8006 also indicates high PV voltage.

4. What does error code 8005 mean?

Answer:

Error code 8005 means the solar or PV input voltage is low.

Check the following:

1. Confirm the solar panels are exposed to adequate sunlight.
2. Check whether the solar isolation switch is ON.
3. Inspect the solar connectors.
4. Check for shading, damaged panels or loose wiring.
5. Confirm the PV input voltage is within the PM300 operating range.
6. Check for excessive voltage drop in the solar cable.

Low solar voltage may be normal at night, during heavy cloud or when panels are shaded.

5. Why is the starter-battery LED flashing quickly?

Answer:

A quickly flashing starter-battery LED indicates that the starter battery voltage is outside the expected range while AC mains is connected.

The manual identifies this condition when the starter battery is approximately:

• Between 2V and 13.4V, or
• Above 16V.

Follow these steps:

1. Check the starter battery voltage.
2. Inspect the starter battery wiring.
3. Confirm the positive and negative connections are secure.
4. Check the vehicle charging system.
5. Confirm the battery is a 12V battery.
6. Arrange inspection if the voltage is above 16V or remains abnormally low.

Monitor codes 8013 and 8014 indicate low and high starter-battery voltage respectively.

6. Why is the red Fuse LED illuminated?

Answer:

A solid red Fuse LED indicates a blown output fuse.

Follow these steps:

1. Turn off the affected load.
2. Locate the blown fuse.
3. Inspect the connected appliance and wiring.
4. Check for short circuits, damaged insulation or overload.
5. Correct the cause of the fault.
6. Replace the fuse with the same type and rating.
7. Turn the load back on.
8. Confirm the replacement fuse does not fail again.

Do not replace a fuse with a higher-rated fuse.

Repeated fuse failure indicates a wiring or appliance fault that requires investigation.

7. What does a solid red Fault LED mean?

Answer:

A solid red Fault LED indicates a short circuit.

Error code 8016 also indicates an output short circuit.

Follow these steps:

1. Switch off the DC loads.
2. Disconnect recently installed or suspect equipment.
3. Inspect the output wiring.
4. Check for crushed cables, exposed conductors or reversed polarity.
5. Check the affected output fuse.
6. Correct the wiring fault.
7. Reconnect one load at a time.

Do not repeatedly replace fuses or reset the system without correcting the short circuit.

8. What does one flash of the red Fault LED mean?

Answer:

One flash per cycle indicates low service battery voltage.

Error code 8003 also indicates low battery voltage.

Follow these steps:

1. Turn off unnecessary loads.
2. Connect AC mains, solar or vehicle charging.
3. Check the service battery voltage.
4. Allow the battery to charge above the reconnect threshold.
5. Check the battery terminals.
6. Test the battery if it discharges again quickly.

Default disconnect levels are approximately:

• 10.5V for AGM, GEL and WET batteries.
• 11.2V for LFP lithium batteries.

A battery that will not accept or retain charge should be professionally tested.

9. What does two flashes of the red Fault LED mean?

Answer:

Two flashes per cycle indicate high service battery voltage.

Error code 8004 also indicates high battery voltage.

Follow these steps:

1. Turn off charging sources where safe.
2. Check the service battery voltage.
3. Confirm the selected battery type.
4. Confirm the battery setting matches on the PM335 and monitor.
5. Check the solar-controller input.
6. Check the alternator charging voltage.
7. Arrange qualified inspection if the voltage remains high.

The PM300 may disconnect the charger and loads during a battery-overvoltage condition.

10. What does three flashes of the red Fault LED mean?

Answer:

Three flashes per cycle indicate that the PM300 master unit is overheating.

Error code 8012 indicates high internal temperature.

Follow these steps:

1. Reduce the connected load.
2. Disconnect high-current appliances.
3. Check that the cooling openings are clear.
4. Confirm there is adequate space around the unit.
5. Check whether the cooling fan is operating.
6. Allow the unit to cool.
7. Restart the system after the temperature has returned to normal.

The PM300 reduces output at high temperature and may shut down at approximately 65°C.

Do not continue operating the system if the unit, connectors or cables remain excessively hot.

11. What does six flashes of the red Fault LED mean?

Answer:

Six flashes per cycle indicate that the surrounding environmental temperature is too high.

Error code 8030 indicates high environmental temperature.

Follow these steps:

1. Improve airflow around the PM300.
2. Remove items blocking the cooling vents.
3. Check whether the unit is installed near another heat source.
4. Reduce the electrical load.
5. Allow the compartment to cool.
6. Check the external temperature sensor where fitted.

Do not install the unit in a sealed compartment without suitable ventilation.

12. What does error code 8010 mean?

Answer:

Error code 8010 indicates that the service battery temperature is too high.

Follow these steps:

1. Stop charging the battery.
2. Turn off high-current loads.
3. Check whether the battery is hot, swollen or venting.
4. Confirm the battery temperature sensor is correctly attached.
5. Improve ventilation around the battery.
6. Allow the battery to cool.
7. Arrange battery testing if the temperature rises again.

Do not continue charging a swollen, damaged, leaking or excessively hot battery.

13. What does error code 8011 mean?

Answer:

Error code 8011 indicates that the battery temperature is too low.

Follow these steps:

1. Check the battery’s actual temperature.
2. Inspect the temperature sensor and cable.
3. Confirm the sensor is attached to the service battery.
4. Check for a loose or damaged sensor connection.
5. Confirm the battery manufacturer permits charging at the measured temperature.

Lithium batteries may have specific low-temperature charging restrictions.

14. What does four flashes of the red Fault LED mean?

Answer:

Four flashes per cycle indicate a Bulk charging timeout.

Error code 8031 also indicates that the Bulk charging stage has exceeded the permitted time.

Follow these steps:

1. Turn off unnecessary DC loads.
2. Check the battery terminals.
3. Check for undersized or damaged battery cables.
4. Confirm the battery type is correct.
5. Confirm the battery-capacity setting is correct.
6. Check whether the battery is accepting charge.
7. Fully test the service battery.
8. Restart charging after the cause has been corrected.

A battery with a failed cell or reduced capacity may remain in Bulk charging for too long.

15. What does five flashes of the red Fault LED mean?

Answer:

Five flashes per cycle indicate a VCR or alternator-charging anomaly.

Monitor codes may include:

• 8027: VCR connection error.
• 8028: VCR disconnection error.

Follow these steps:

1. Disconnect the caravan from the towing vehicle.
2. Check the starter battery voltage.
3. Inspect the vehicle charging cables.
4. Check the D+ input where fitted.
5. Check the negative return connection.
6. Inspect the trailer plug and socket.
7. Reconnect the vehicle and start the engine.
8. Check whether the starter-battery LED becomes solid.

Arrange inspection by a qualified auto electrician if the VCR continues connecting or disconnecting incorrectly.

16. What does error code 8001 mean?

Answer:

Error code 8001 means communication has been lost between the monitor and the master power unit.

Follow these steps:

1. Confirm the PM335 master unit has power.
2. Check the monitor communication cable.
3. Disconnect and reconnect both ends of the cable.
4. Inspect the connector pins.
5. Check for damaged or crushed cable.
6. Restart the PM300.
7. Disconnect other T-Bus accessories temporarily where applicable.

Arrange technical inspection if communication cannot be restored.

17. What does error code 8015 mean?

Answer:

Error code 8015 indicates an output overload.

Follow these steps:

1. Turn off high-current appliances.
2. Check the combined current used by connected loads.
3. Disconnect recently installed equipment.
4. Confirm each load is connected to a suitable output.
5. Check the output-fuse ratings.
6. Inspect for partially shorted wiring.
7. Reconnect loads one at a time.

The PM300 may reduce its output until the overload is removed.

18. What does error code 8017 mean?

Answer:

Error code 8017 indicates that an internal module-protection function has operated.

Follow these steps:

1. Turn off the connected loads.
2. Disconnect AC mains.
3. Isolate solar and vehicle charging where safe.
4. Turn the PM300 battery switch off.
5. Wait several minutes.
6. Restore the battery and charging sources.
7. Check whether the error returns.

Contact Projecta Technical Support if code 8017 returns after the system is restarted.

Do not open or attempt to repair the PM335 master unit.

19. Why is the displayed battery percentage or time remaining inaccurate?

Answer:

Follow these steps:

1. Confirm the battery type is correct.
2. Confirm the battery capacity is correct.
3. Confirm the DIP-switch settings match the monitor.
4. Check for loads connected directly to the battery.
5. Check for chargers connected directly to the battery.
6. Fully charge the battery from AC mains.
7. Continue charging until the CHG LED is solid or FLOAT appears.
8. Clear the maintenance notice if code 8018 is displayed.

Loads that bypass the PM335 are not included in the battery-monitor calculation.

20. What does error code 8018 mean?

Answer:

Error code 8018 is a battery-monitor maintenance reminder.

It does not necessarily indicate a component failure.

Follow these steps:

1. Connect the PM300 to AC mains.
2. Confirm the battery switch is ON.
3. Fully charge the service battery.
4. Continue charging until the CHG LED is solid or FLOAT appears.
5. Press the SILENT button for approximately one second to clear the reminder.

Perform this maintenance at least every three months.

21. Why does the remote battery switch not work?

Answer:

Follow these steps:

1. Confirm the local/remote selector is set to Remote.
2. Check the remote-switch wiring.
3. Inspect the terminal connections.
4. Confirm the remote switch opens and closes correctly.
5. Check whether another power source is supplying the loads.
6. Confirm the service battery is connected.
7. Check for an active fault or low-voltage condition.

When the selector is set to Local, the remote switch is disabled.

When set to Remote, the switch on the PM335 is disabled.

22. Why will the water pump not operate?

Answer:

Follow these steps:

1. Confirm the service battery and DC loads are switched on.
2. Press the PUMP button.
3. Check whether the pump symbol appears.
4. Enter the monitor settings and confirm Pump 1 is enabled.
5. Check the water-pump fuse.
6. Inspect the pump wiring.
7. Check the pump pressure switch.
8. Check whether the service battery is below the low-voltage threshold.
9. Test the pump directly only using an approved diagnostic process.

A repeatedly blown pump fuse may indicate a seized pump, damaged cable or short circuit.

23. What do the water-tank error codes mean?

Answer:

The PM300 monitor uses the following water-tank notifications:

• 8019: Water tank 2 is full.
• 8020: Water tank 3 is full.
• 8021: Water tank 1 is empty.
• 8022: Water tank 2 is empty.
• 8023: Water tank 3 is empty.
• 8024: Water tank 4 is empty.
• 8025: Water tank 1 is full.
• 8026: Water tank 4 is full.

These codes may represent a genuine tank level or an incorrect probe reading.

Check the following:

1. Confirm the actual tank level.
2. Inspect the probe connection.
3. Check the probe cable.
4. Confirm the correct probe is connected to the correct tank input.
5. Check for contamination or deposits on the probe.
6. Confirm the probe is suitable for the tank depth.

24. Why is a water tank showing the wrong level?

Answer:

Follow these steps:

1. Confirm the correct tank is being viewed.
2. Check the tank probe connection at the PM335.
3. Confirm the probe is connected to the intended tank port.
4. Inspect the probe for contamination.
5. Check whether the probe is installed at the correct height and angle.
6. Confirm the probe length is suitable for the tank.
7. Inspect the extension cable and connectors.
8. Restart the monitor.

Incorrect probe selection, installation or wiring can cause inaccurate level readings.

Safety Warnings

• Disconnect the 240V AC supply before making or breaking battery connections.
• Connect the PM300 only to an earthed AC outlet.
• Fixed AC wiring must comply with applicable electrical wiring rules.
• Do not use the system if the AC lead is damaged.
• Do not charge a frozen or non-rechargeable battery.
• Use the correct battery type and charging-voltage setting.
• Keep flames, sparks and ignition sources away from batteries.
• Provide adequate ventilation during charging.
• Do not expose the PM300 to rain.
• Solar panels may remain electrically live during daylight.
• Do not replace a fuse with a higher-rated fuse.
• Stop using a battery that is swollen, leaking, venting, excessively hot or physically damaged.

When to Contact Projecta Technical Support

Contact Projecta Technical Support when:

• The same fault returns after the recommended checks.
• Error code 8017 remains active.
• The Mains LED continues flashing with a suitable AC supply.
• Battery overvoltage continues after charging sources are disconnected.
• The PM300 repeatedly overheats.
• Fuses continue to fail.
• Communication cannot be restored.
• The VCR or alternator-charging circuit operates incorrectly.
• Wiring, connectors or the master unit show heat damage.

Provide:

• Product model: PM300.
• Master-unit model: PM335.
• Monitor model.
• Battery type and capacity.
• Battery voltage.
• Charging sources connected.
• LED status.
• Fault-flash count.
• Monitor error code.
• Details of connected loads.
• Photos of wiring and connectors where safe.
• Proof of purchase where warranty assessment may be required.

Projecta Technical Support: 1800 422 422