129
Measures
1. Isolate the system from the power supply. Wait at
least 2 min. Switch on the system.
2. Replace inverter.
F.834 Inverter phase fault on mains side
F.834
System characteristics
Refrigerant circuit off: Inverter and compressor cannot
be switched on.
Cause
Power supply on inverter faulty
Measures
1. Check all connections to the compressor:
■
Check wires and plugs for correct seating.
■
Check connections for contact corrosion.
■
Check cables for mechanical damage, e.g. crush-
ing, kinking, chafing or breakage.
Replace cable if necessary.
2. Check phase connections for compressor for clock-
wise rotating field.
3. Check for correct connection of power-OFF signal:
■
Without on-site load disconnect:
Connection directly to the heat pump control unit
■
With on-site load disconnect:
Connection directly to the heat pump control unit
and to the on-site contactor for the economy tariff
■
No power-OFF signal to power supply on heat
pump control unit
4. Isolate the system from the power supply. Wait at
least 2 min. Switch on the system.
5. Replace inverter.
F.835 Inverter parameter settings faulty
F.835
System characteristics
Refrigerant circuit off: Inverter and compressor cannot
be switched on.
Cause
Incorrect compressor installed
Measures
1. Check the inverter and compressor used.
2. Carry out heat pump commissioning again.
3. Run software update if required.
F.836 Load current of inverter too high (excess current)
F.836
System characteristics
Refrigerant circuit off: Inverter and compressor cannot
be switched on.
Cause
Inverter load current too high (excess current):
■
Short circuit between phases
■
Blocked compressor armature
Measures
1. Check all connections to the compressor:
■
Check wires and plugs for correct seating.
■
Check connections for contact corrosion.
■
Check cables for mechanical damage, e.g. crush-
ing, kinking, chafing or breakage.
Replace cable if necessary.
2. Check phase connections for compressor for clock-
wise rotating field.
3. Isolate the system from the power supply. Wait at
least 2 min. Switch on the system.
Messages
Fault messages (cont.)
6218234
Diagnosis
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