Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 110
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.867
Heat pump off
F.876
The heat pump is switched
off.
F.881
The refrigerant circuit will not
start.
F.912
Refrigerant circuit off
F.913
Refrigerant circuit off
F.983
The refrigerant circuit will not
start.
F.984
The refrigerant circuit will not
start.
110
Cause
Float air vent valve in the
outdoor unit has respon-
ded.
Too much air in the sec-
■
ondary circuit during
venting
Quick-action air vent
■
valve may be faulty
Or
Refrigerant present in
■
the float air vent valve
Lead break, flow sensor
Refrigerant circuit safety
shutdown
Interior temperature sen-
sor fault
Interior temperature too
high
Internal inverter fault
Control of electronic ex-
pansion valve 1 faulty
Measures
Specialist personnel working on a
refrigerant circuit with flammable
refrigerant are required to have
specific qualifications and certifica-
tion: See "Safety information".
Danger
Escaping refrigerant can
lead to explosions that result
in very serious injuries.
Observe guidance on meas-
ures and steps to take in the
event of escaping refriger-
ant: See "Safety informa-
tion".
If a message appears during
venting:
Check the quick-action air vent
■
valve. Replace quick-action air
vent valve if required.
Restart filling programme.
■
If a message appears during op-
eration:
Isolate the system from the pow-
■
er supply.
Shut off the hydraulic connection
■
between the indoor and outdoor
unit.
Notify Viessmann Werke Techni-
■
cal Service.
Check flow sensor. Replace flow
sensor if required.
Isolate the system from the power
supply. Restart the system.
If the fault persists, replace the in-
verter.
Check resistance value
(NTC 10 k
) at connec-
Ω
tion P1.8/P1.9 on the inverter. Re-
place sensor if required.
Reduce ambient temperature,
for example through sun protec-
tion.
Check inverter. Replace inverter if
required.
Check connections on VCMU re-
■
frigerant circuit controller.
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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