Troubleshooting; Alarm - Danfoss DHP-AX Installation And Service Instructions Manual

15

Troubleshooting

15.1

Alarm

Shown in display in the event of an alarm. To reset alarms 1-5, set the operating mode to OFF or cut the power
supply.
Message
HIGH PRESSURE ERROR
LOW PRESSURE ERROR
MOTOR P ERROR
OUTDOOR SENSOR
SUPPLY LINE SENSOR
RETURN LINE SENSOR
HOT WATER SENSOR
ERR PHASE SEQ.
HIGH RETURN
RAD FLOW LOW
44 – Service
Meaning
Tripped high pressure switch. Compressor stopped. No hot water production.
Tripped low pressure switch. Compressor stopped. No hot water production.
Deployed motor protection (Over current relay compressor), or deployed motor protection
for outdoor unit fan. Compressor stopped. No hot water production.
Fault in outside sensor. When the control system calculates the heat demand, zero degrees
is used.
Supply line sensor error. Everything stops except the heating system's circulation pump.
Return sensor fault. Return temperature = Supply line – 5 is used. Calculated supply tempe-
rature limited to maximum 45°C.
Fault on sensor for start temperature. No hot water production.
Alarm that indicates that there is an incorrect phase sequence to the compressor. Only dis-
play and only the first 10 minutes.
Alarm that indicates that high return temperature prevents the compressor's operation.
The flow sensor produces an alarm when the water flow in the heating system becomes too
low.
VMBMH302