Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 104
Air source heat pump, monoblock version for heating and cooling operation, with 1 integrated heating/cooling circuit
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Also See for VITOCAL 151-A:
- Operating instructions for the system user (60 pages) ,
- Manual (24 pages)
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Troubleshooting
Fault messages
(cont.)
Message code
System characteristics
F.625
Mixer closes. Heating circuit
pump switches off.
F.626
Mixer closes. Heating circuit
pump switches off.
F.627
Mixer closes. Heating circuit
pump switches off.
F.628
Mixer closes. Heating circuit
pump switches off.
F.629
Mixer closes. Heating circuit
pump switches off.
F.630
Mixer closes. Heating circuit
pump switches off.
F.685
Function of connected com-
■
ponents in emergency
mode
Frost protection enabled
■
F.686
The refrigerant circuit will not
start.
104
Cause
Lead break, return tem-
perature sensor, heating/
cooling circuit 2
Short circuit, return tem-
perature sensor, heating/
cooling circuit 2
Lead break, return tem-
perature sensor, heating/
cooling circuit 3
Short circuit, return tem-
perature sensor, heating/
cooling circuit 3
Lead break, return tem-
perature sensor, heating/
cooling circuit 4
Short circuit, return tem-
perature sensor, heating/
cooling circuit 4
HPMU electronics module
communication error
VCMU refrigerant circuit
controller communication
error
Measures
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check resistance value
■
(NTC 10 k
) at mixer extension
Ω
kit. Replace sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check resistance value
■
(NTC 10 k
) at mixer extension
Ω
kit. Replace sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check resistance value
■
(NTC 10 k
) at mixer extension
Ω
kit. Replace sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check resistance value
■
(NTC 10 k
) at mixer extension
Ω
kit. Replace sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check resistance value
■
(NTC 10 k
) at mixer extension
Ω
kit. Replace sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check resistance value
■
(NTC 10 k
) at mixer extension
Ω
kit. Replace sensor if required.
Check the connections to the
■
HPMU electronics module.
Check whether components are
■
wrongly connected.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
HPMU electronics module.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check connections on VCMU re-
■
frigerant circuit controller.
Check whether components are
■
wrongly connected.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace the
VCMU refrigerant circuit control-
ler.
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