Troubleshooting; Alarm - Danfoss DHP-AQ Series Service Instructions Manual

Service Instructions
3

Troubleshooting

3.1

Alarm

In event of alarm this is indicated in the display with the text ALARM and an alarm message, see following table. For alarms that are not
reset automatically acknowledgement is required. Acknowledge the alarm by setting the heat pump to operating mode OFF and then
back to the desired operating mode.
Message
MOTOR P COMP.ERROR
MOTOR P FAN ERROR
EL. HEATER ERROR
HEAT / PRESSURE ERROR
LOW PRESSURE ERROR
LOW PRESSURE TRANSDUCER
HIGH PRESSURE ERROR
LOW HEAT CIR. FLOW
MAX TEMP ELEC. HW
NO. OF TRIES X/5(where X=1...5) Circulation pump is jammed. Start attempt made.
HEATING CIRC. PUMP
HEATING SYSTEM PUMP
OUTDOOR SENSOR
DEFROST SENSOR
SUPPLY LINE SENSOR
SYSTEM SUPPLY LINE SENSOR
RETURN LINE SENSOR
HIGH RETURN LINE TEMP
BUFFER TANK SENSOR
HGW SENSOR
HOT WATER SENSOR
HOT WATER TOP
FAILSAFE MODE
REFR.1 SENSOR
REFR.2 SENSOR
LOW RETURN TEMP 1
LOW RETURN TEMP 2
LOW EVAP. TEMP 1
LOW EVAP. TEMP 2
SUCTION TEMP SENSOR
ROOM SENSOR
DISCHARGE PIPE SENSOR
DISTR. CIR. 1 SENSOR
DISTR. CIR. 2 SENSOR
POOL SENSOR
COM. ERROR HP-CARD
COM. ERROR HUB-CARD
10
DHP-AQ
Meaning
The compressor motor protection has deployed.
The fan motor protection has deployed.
The electrical heater overheating protection has deployed.
The expected pressure and temperature change in the refrigerant circuit has not happened in the
correct way at compressor start.
Evaporation pressure has fallen too low.
Fault in low pressure transmitter alternatively cable fault.
High pressure switch has deployed.
The flow sensor has registered too low a flow.
Too high temperature in heat pump junction box/electrical cabinet.
Circulation pump is jammed.
Circulation pump is jammed.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault. Defrost sensor.
Sensor fault alternatively cable fault. Supply line sensor.
Sensor fault alternatively cable fault. System supply line sensor.
Sensor fault alternatively cable fault. Return line sensor.
Return line temperature too high
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault (the lower sensor, Start sensor).
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault on one of the refrigerant sensors. The heat pump goes to fail-
safe mode and defrosts on time.
Sensor fault alternatively cable fault. Refrigerant sensor 1
Sensor fault alternatively cable fault. Refrigerant sensor 2
The return line temperature is too low to start a defrosting.
The return line has fallen too low during defrosting.
Evaporation temperature too low.
Too great a deviation in evaporation temperature average value.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault.
Sensor fault alternatively cable fault.
Communication broken between display card and heat pump card (outdoor).
Communication broken between display card and hub card (indoor).
VMGFJ202 Danfoss Heating Solutions