What To Do If; Troubleshooting Guide; Repairs - Viessmann VITOCAL 300 Operating Instructions Manual

What to do if ...

Troubleshooting guide

Any fault in the heat pump will be shown in the display field, when the flap is
closed. In addition the control unit indicates, what you should do in case of
various types of fault.
For heat pumps with two compressor stages:
The control unit starts the second compressor stage if the first compressor
stage drops out. This provides you with heating until you can arrange a
repair.
What to do if ...
... A0 or A1 is displayed
... the display appears
dark
... A3 is displayed
... A4 is displayed
... A5 or A6 is displayed
... A7 is displayed
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Cause
No fault/external control
Power failure/
mains supply has failed/
incorrect phase
sequence
Fuse dropped out/blown Notify your local
Type BW:
Brine pressure too low
or
Type WW:
Flow switch activated
No faults: Off−period
imposed by your local
electricity supplier
Safety switch activated
Type AW:
Ventilation duct clogged
Type BW:
Primary circuit leaks,
primary pump faulty
or
Type WW:
Intermediate circuit
leaks, intermediate
circuit pump faulty
Remedy
The heat pump starts up
automatically, as soon
as the power is restored
or the fault is remedied
specialist
Notify your local
specialist
Notify your local
specialist
Check and clean the
ventilation duct
Check pressure gauge
and primary pump;
notify your local
specialist