Viessmann Vitocal 300-G Installation And Service Instructions Manual page 133

Control unit diagnostics
The info line in the display contains a left hand and right hand group of fig-
ures:
Compressor stage 1
Fault
Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7
0 0 0 0
In connection with compressor
stage 1, we differentiate between
faults and messages (groups 1 to
4).
In connection with compressor
stage 2, the same differentiation is
made between faults and messages
(group 5 and 8 respectively).
Faults and messages are stored
and displayed before the heat pump
module has switched off the com-
pressor.
Group 1 (faults)
01 Suction pressure sensor faulty
02 Suction gas temperature sensor
faulty
04 Condensation pressure sensor
faulty
08 Condensation temperature sensor
faulty
Load classes
Call up diagnosis page "Load classes" via key "ÓH":
Hours run [h] display of the heat
pump subject to the respective load.
Hours run [h] are cumulative start-
ing from the commissioning. These
cannot be deleted.
(cont.)
Reports
0 0 0 0 00
10 LPG temperature sensor faulty
20 Stepper motor electronic expan-
Group 2 (faults)
00 no further faults
Group 3 (messages)
01 Actual condensation temperature
02 Condensation pressure too high
04 Inadequate superheating
08 Excessive superheating
10 Inadequate suction pressure (low
Group 4 (messages)
01 MOP mode enabled
02 Configuration error
The temperature ramp is the result
of the temperature differential
between the evaporation tempera-
ture and the condensation tempera-
ture.
The temperature ramp is shown for
compressor stage 1 and, if installed,
also for compressor stage 2.
Troubleshooting
Compressor stage 2
Fault Reports
00 00
sion valve (EEV) faulty
too high
(control high pressure)
pressure)
Group 8
00
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