C2 Power Supply - Viessmann VITOTRONIC 200 Service Instructions Manual

Troubleshooting
Message overview

C2 Power supply

Compressor stops.
Cause
Compressor power supply fault or phase monitor faulty
C3 Pressure switch prim.
Compressor stops.
Cause
Pressure in primary circuit too low
C5 Power-OFF
Compressor stops.
Cause
Power-OFF active (triggered by power supply utility)
C9 Refrigerant circ (SHD)
■ Compressor is switched off.
■ Central heating and DHW heating occurs with other
heat sources enabled for this purpose, e.g. an exter-
nal heat generator or instantaneous heating water
heater.
■ The operation with booster heaters depends on the
setting "Operating status after message A9, C9
701C".
Cause
Refrigerant circuit fault:
Safety high pressure switch has responded.
■
Fan faulty
■
Primary pump faulty
■
96
(cont.)
Measure
Check connections, power supply and phase connec-
tion.
Check phase monitor.
The switching signal of the phase monitor can be
checked at terminal 215.2: See "Main PCB".
0 V Fault
230 V~ No fault
Measure
Check the primary circuit for pressure, flow rate and
leaks. Top up heat transfer medium if necessary.
If no pressure switch is installed in the primary circuit,
insert a jumper across X3.8/X3.9: See "Luster termi-
nals".
The signal from the pressure switch can be measured
at terminals X3.8/X3.9 against X2.N.
0 V Pressure switch has responded.
230 V~ Pressure switch has not responded.
Measure
No action required.
If the message is constantly present: Check connection
at terminal X3.7 (feed) first, then at terminal X3.6
(230 V~) (see "Cross connect PCB"/"Luster terminals").
Measure
Check flow and return temperature sensors in primary
■
and secondary circuits.
Check primary and secondary circuits for pressure
■
and flow rate: See message "A9 Heat pump".