In this article, we will explore the most common error codes in air-to-water heat pumps with designations E1, E3, E4, E5, and E9. These error codes are critical tools for diagnosing specific issues within the system. Below, we describe each error in detail, including its meaning, possible causes, and recommended solutions.
Error E1: Compressor PCB Failure
Meaning: This code indicates a fault in the Printed Circuit Board (PCB) of Compressor 1.
Possible Causes:
- Loose or incorrect connections.
- Improper voltage supply.
- PCB damage.
Solutions:
- Turn off and disconnect the unit from the power supply. Check and adjust all electrical, communication, and sensor connections.
- Ensure the voltage supplied to the unit is correct.
- Restart the unit. If the problem persists, the PCB may need to be replaced.
Error E3: High Pressure Detected by the Pressure Switch
Meaning: This error occurs when the high-pressure switch detects abnormal pressure conditions in the condenser.
Possible Causes:
- Air in the water circuit.
- Obstructed water filter.
- Closed valves.
- Thermal protection activation.
Solutions:
- Inspect the electrical connections of the indoor and outdoor units.
- Ensure the water circuit is completely filled and free of air.
- Confirm that all system valves are open.
- Check and clean the water filter if it is clogged.
- If the thermal protection is triggered, reset it and verify the water supply to the system.
Error E4: Low Pressure Detected by the Sensor
Meaning: This code indicates low pressure detection in the system.
Possible Causes:
- Faulty evaporator fan.
- Dirty heat exchanger.
- Incorrect electrical connections.
Solutions:
- Verify the electrical connections of the indoor and outdoor units.
- Inspect the condition of the evaporator fan and ensure it operates correctly.
- Clean the outdoor unit’s heat exchanger.
Error E5: Compressor Overload
Meaning: This error indicates that the compressor is operating above its normal capacity.
Possible Causes:
- Insufficient or irregular voltage supply.
- Faulty electrical connections.
- Issues with the water supply.
Solutions:
- Check the voltage supplied to the unit.
- Inspect the electrical connections for faults.
- Ensure the system is properly supplied with water.
Error E9: Issues with the Electronic Expansion Valve
Meaning: This code signals a problem with the electronic expansion valve.
Possible Causes:
- Faulty wiring connections.
- Incorrect sensor placement.
Solutions:
- Inspect the wiring connections of the sensors and confirm their correct placement.
- Check the wiring connections of the electronic expansion valve.
