Appendix
34 Installation instructions Heat pump control interface module 0020291573_00
Code Meaning Cause
Remedy
F.823 Hot gas temperature switch open – The hot gas thermostat shuts down
the heat pump if the temperature
in the refrigerant circuit is too high.
Following a waiting period, the heat
pump attempts to start once more.
After three failed start attempts
in succession, a fault message is
displayed.
– Max. refrigerant circuit temperature:
110 °C
– Waiting period: 5 mins (after it first
occurs)
– Waiting period: 30 mins (after it
occurs a second time and any other
time after that)
– The fault counter is reset if both of
the following conditions are met:
– Heat requirement without switch-
ing off prematurely
– 60 mins uninterrupted operation
– Check the EEV
– Replace the dirt filter in the refrigera-
tion circuit, if required
F.825 Sensor fault: Capac. inlet temp. – Refrigerant circuit temperature
sensor (vapour-forming) not con-
nected or the sensor input has short-
circuited
– Check and, if required, replace the
sensor and cable
F.1117 Compressor: Phase failure – Defective fuse
– Incorrect electrical connections
– Mains voltage too low
– Compressor/low tariff power supply
not connected
– Blocked by energy supply company
for over three hours
– Check the fuse
– Checking the electrical connections
– Check the voltage at the heat pump
electrical connection
– Reduce energy supply company
anti-cycling time to under three hours
F.9998 Connection fault: Heat pump – eBUS cable not connected or con-
nected incorrectly
– Outdoor unit without supply voltage
– Check the connection pipes between
the power supply PCB and control
PCB on the indoor and outdoor unit
G Characteristic values for the internal temperature sensors, hydraulic circuit
Sensors: TT620 TT650
Temperature (°C) Resistance (ohms)
0 33400
5 25902
10 20247
15 15950
20 12657
25 10115
30 8138
35 6589
40 5367
45 4398
50 3624
55 3002
60 2500
65 2092
70 1759
75 1486
80 1260
85 1074
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