110
F.155 Fault, electronic expansion valve 1
F.155
System characteristics
Normal operation
Cause
Temporary deviation from the setting for electronic
expansion valve 1
Measures
No action required
F.156 Fault, electronic expansion valve 2
F.156
System characteristics
Normal operation
Cause
Temporary deviation from the setting for electronic
expansion valve 2
Measures
No action required
F.160 Communication fault, CAN bus
F.160
System characteristics
Display on HMI programming unit: "Connection error".
No communication between HMI programming unit
and HPMU electronics module.
Cause
Communication fault CAN bus
Measures
1. Suppress electromagnetic interference on CAN bus
connections. Check the cable routing between the
electronics module and the components. Change if
necessary.
2. Check connections of CAN bus subscriber and con-
figuration.
3. Check position and number of terminators in the
CAN bus system.
4. Check the terminator (120 Ω) at the start and end of
the CAN bus system in zero voltage condition at
CAN high/CAN low. Set value: Approx. 60 Ω
F.425 Time synchronisation failed
F.425
System characteristics
■
Heat pump in control mode
■
No energy statement calculation
Cause
Time synchronisation not possible as battery voltage in
HPMU electronics module is too low
Messages
Fault messages (cont.)
6218234
Diagnosis
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