May be due to/checkHeat pump action.CauseAlarm text on the
display
Alarm
no.
• Open-circuit or short-cir-
cuit on sensor input.
• Defective sensor
Cooling blocked. Cooling
shunt closes.
No contact with the sensor
(temperature sensor, cool-
ing supply line).
Err: EQ1-BT6439
Phase failure.Compressor blocked.The compressor phase
mentioned has been below
160 V for 30 min.
Compr.phs 1-340-42
The phase order of the in-
coming electrical supply is
wrong.
Compressor blocked.The phases are connected
in the wrong order.
In phs seq43
• Defective fuse.
• Defective soft start card.
Compressor blocked.Fuses on the soft-start
board are defective (applies
to 30, 40 and 60 kW).
Fault in the soft-
start fuses.
44
Incorrect phase sequence
or missing phase.
Compressor blocked.Communication with the
soft-start board has been
missing continuously for
30 minutes.
Phase fault (incor-
rect phase se-
quence or miss-
ing phase).
45
Insufficient circulation of
the brine.
Compressor blocked.Low pressure sensor
transmitter is below cut-out
value.
LP alarm51
• Check the brine pump.
• Check that the brine has
been vented.
• Check the brine’s freez-
ing point.
Lack of heating medium or
other fault in the cooling
circuit.
• Contact an authorised re-
frigeration technician.
Insufficient flow.None (managed via hard-
ware).
The temperature limiter has
deployed and been “open”
for longer than 30 seconds.
Temperature lim-
iter alarm
52
• Check the circulation
pump.
• Check that the heating
medium has been ven-
ted.
• Check the pressure in the
heating medium system.
Leakage in the brine circuit.Compressor and brine
pump blocked.
Brine level switch/ pressure
switch has tripped.
Lvl sen Br53
• Phase failure.
• Defective compressor.
Compressor blocked.The motor protection
breaker has tripped.
MP alarm54
Defective compressor.Compressor blocked.The compressor has been
stopped 3 times in
240 minutes because the
hot gas has exceeded
135 °C.
Hot gas alarm55
Incorrectly entered serial
number.
Compressors are stopped
and relay is deactivated.
The heat pump has a serial
number that does not exist.
Erroneous serial
no
56
57Chapter 5 | Disturbances in comfortNIBE F1345
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