Danfoss DHP-S 7Ua, User Manual

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5 Troubleshooting
5.1 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 auto-
matically acknowledgement is required. Acknowledge the alarm by set-
ting the heat pump to operating mode OFF.
Message Meaning
HIGH PRESSURE
ERROR
Tripped high pressure switch. Compressor stopped.
LOW PRESSURE
ERROR
Tripped low pressure switch. Compressor stopped.
MOTOR P ERROR Deployed overload relay (Overcurrent relay compressor),
or deployed overload relay for outdoor unit fan. Com-
pressor stopped.
OUTDOOR SENSOR Fault in outside sensor. When the control system calcu-
lates the heat demand, zero degrees is used.
SUPPLY LINE SEN-
SOR
Supply line sensor error. Everything stops except the
heating system’s circulation pump.
RETURN LINE SEN-
SOR
Return sensor fault. Return temperature = Supply line – 5
is used. Calculated supply temperature limited to maxi-
mum 45°C.
HOT WATER SENSOR Fault on sensor for start temperature. No hot water pro-
duction.
ERR PHASE SEQ. Alarm that indicates that there is an incorrect phase
sequence to the compressor. Only display and only the
first 10 minutes.
HIGH RETURN Alarm that indicates that high return temperature pre-
vents the compressor’s operation.
BRINEFLOW LOW The flow sensor produces an alarm when the ambient
temperature of the brine circuit becomes too low.
In event of alarm the heat pump will if possible supply heating to the
house, primarily with the compressor, secondarily with the additional
heater. Hot water will stop to indicate that something noteworthy has
occurred.
User manual
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