Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 102
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.520
Refrigerant circuit off
F.542
Mixer closes. Heating circuit
pump is operational.
F.543
Mixer closes. Heating circuit
pump is operational.
F.544
Mixer closes. Heating circuit
pump is operational.
F.545
Mixer closes. Heating circuit
pump is operational.
102
Cause
Communication error,
Modbus
Lead break, flow tempera-
ture sensor, heating/cool-
ing circuit 1 with mixer
Or
Wrong setting during com-
missioning
Short circuit, flow temper-
ature sensor, heating/cool-
ing circuit 1 with mixer
Lead break, flow tempera-
ture sensor, heating/cool-
ing circuit 2 with mixer
Or
Wrong setting during com-
missioning
Short circuit, flow temper-
ature sensor, heating/cool-
ing circuit 2 with mixer
Measures
Check the Modbus cable be-
■
tween inverter and refrigerant cir-
cuit controller VCMU at connec-
tion X11/X13 on refrigerant cir-
cuit controller VCMU.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace the
VCMU refrigerant circuit control-
ler and/or the inverter.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check setting of rotary switch S1
■
on ADIO electronics module.
Check flow temperature sensor
■
in heating/cooling circuit 1.
Check resistance value
■
(NTC 10 k
) at the sensor input
Ω
on ADIO electronics module. Re-
place sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check setting of rotary switch S1
■
on ADIO electronics module.
Check flow temperature sensor
■
in heating/cooling circuit 1.
Check resistance value
■
(NTC 10 k
) at the sensor input
Ω
on ADIO electronics module. Re-
place sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check setting of rotary switch S1
■
on ADIO electronics module.
Check flow temperature sensor
■
in heating/cooling circuit 2.
Check resistance value
■
(NTC 10 k
) at the sensor input
Ω
on ADIO electronics module. Re-
place sensor if required.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check setting of rotary switch S1
■
on ADIO electronics module.
Check flow temperature sensor
■
in heating/cooling circuit 2.
Check resistance value
■
(NTC 10 k
) at the sensor input
Ω
on ADIO electronics module. Re-
place sensor if required.
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