Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 107
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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Fault messages
(cont.)
Message code
System characteristics
F.819
The refrigerant circuit will not
start.
F.820
The refrigerant circuit will not
start.
F.823
The refrigerant circuit will not
start.
F.824
The refrigerant circuit will not
start.
F.827
The instantaneous heating
water heater will not start.
F.829
Flow rate too low, insufficient
heat provision
F.830
Refrigerant circuit off: Inverter
and compressor cannot be
switched on.
F.831
Refrigerant circuit off: Inverter
and compressor cannot be
switched on.
Cause
Lead break, electronic ex-
pansion valve 1
Lead break, electronic ex-
pansion valve 2
Short circuit, electronic ex-
pansion valve 1
Short circuit, electronic ex-
pansion valve 2
High limit safety cut-out
has responded.
Filter in ball valve of out-
door unit is contaminated
Power supply on inverter
faulty
Power supply on inverter
faulty
Troubleshooting
Measures
Check connections on VCMU re-
■
frigerant circuit controller.
Check electronic expansion
■
valve 1 via actuator test.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace elec-
tronic expansion valve 1.
Check connections on VCMU re-
■
frigerant circuit controller.
Check electronic expansion
■
valve 2 via actuator test.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace elec-
tronic expansion valve 2.
Check connections on VCMU re-
■
frigerant circuit controller.
Check electronic expansion
■
valve 1 via actuator test.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace elec-
tronic expansion valve 1.
Check connections on VCMU re-
■
frigerant circuit controller.
Check electronic expansion
■
valve 2 via actuator test.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace elec-
tronic expansion valve 2.
Reset the high limit safety cut-
■
out.
Check instantaneous heating wa-
■
ter heater. Replace if required.
Safeguard the minimum flow
■
rate. Check flow sensor. Replace
if required.
Safeguard the minimum flow
■
rate. Check secondary pump /
heating circuit pumps. Replace if
required.
Clean the filter in the outdoor unit
ball valve.
Isolate the system from the power
supply. Restart the system.
If the fault persists, replace the in-
verter.
Isolate the system from the power
supply. Restart the system.
If the fault persists, replace the in-
verter.
107
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