Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 128

Troubleshooting
Control unit diagnostics
Display Description
Pc Condensation pressure heat pump 1 and 2
Err/Msg Faults and messages.
For explanations see the following table.
Faults and messages (Err/Msg)
Heat pump 1 (compressor stage 1)
Fault
Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7
00 00
& Faults and messages are stored
and displayed before the heat pump
module has switched off the com-
pressor.
& Faults and messages are each dis-
played in 4 digit groups for every
heat pump (compressor stage)
("Err/Msg: 00000000")
& Fault group 1 and 5:
See table "Faults at the electronic
expansion valve"
& Fault group 2 and 6:
00 no further faults
Hours run according to load classes
Load class Description
1. Temperature ramp < 25
Temperature ramp ≥ 25 < 32 K
2.
Temperature ramp ≥ 32 < 41 K
3.
Temperature ramp ≥ 41 < 50 K
4.
5. Temperature ramp > 50 K
& The temperature ramp is the tem-
perature differential between the
evaporation temperature and the
condensation temperature.
& The hours run are shown for com-
pressor stage 1 (heat pump 1) and,
if installed, also for compressor
stage 2 (heat pump 2).
128
(cont.)
Heat pump 2 (compressor stage 2)
Messages
00 00 00
& Messages group 3 and 7:
01 Actual condensation tempera-
02 Condensation pressure too high
04 Inadequate superheating
08 Excessive superheating
10 Inadequate suction pressure
& Messages group 4 and 8
01 MOP mode enabled
02 Configuration fault
Fault Messages
00 00
ture too high
(control high pressure)
(low pressure)
Group 8
00