Viessmann VITOTRONIC 200 Service Instructions Manual page 151

Refrigerant circuit
(cont.)
Message Meaning
code
2F Min. required evaporation
H
pressure undershot
30 Operating point outside
H
the compressor applica-
tion limits for longer than
max. time
36 Min. pressure differential
H
between high and low
pressure side exceeded
before compressor start
48 Suction gas superheating
―
too low
49 Evaporator max. operating
―
pressure (MOP) has been
reached; changeover from
superheating to pressure
control of the suction gas.
4A Evaporation temperature
―
too low
80 Max. compressor current
H
exceeded
81 Max. compressor output
H
exceeded
82 Mains voltage too high
H
83 Mains voltage too low
H
84 Temperature at the inver-
H
ter too high
85 Temperature at inverter
H
too low due to low outside
temperature
86 H Inverter power consump-
tion too high
Heat pump characteris-
tics
Compressor OFF
Compressor OFF
Compressor does not start.
Compressor OFF
Compressor remains in op-
eration.
Compressor remains in op-
eration.
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Measure
Check low pressure sensor: See
■
message code "0A".
Check refrigerant charge. Adjust if
■
necessary.
Check the position of the operating
■
point: See "Compressor travel"
and/or "Compressor path".
If fault persists, notify a specialist.
■
Check high and low pressure sen-
■
sors: See message codes "05" and
"0A".
Check secondary circuit flow rate.
■
Check secondary pump.
Ensure pressure compensation be-
■
tween the high pressure and low
pressure sides. For this, switch the
4-way diverter valve with an "Actua-
tor test".
Check whether the correct coding
■
card is fitted. To check information,
see "System information".
In the event of recurrence: Have the
■
refrigerant circuit checked by a re-
frigeration engineer.
No action required
Check fan.
■
Check evaporator for ice formation.
■
Check evaporator temperature sen-
■
sor: See message code "09".
Test coil resistance at compressor. Re-
sistance on all windings must be simi-
lar ( 10 %). For m use a suitable
± Ω
measuring device.
Test mains voltage at mains terminals:
If mains voltage is too high (+10 %),
clarify the cause in consultation with
the power supply utility.
Test mains voltage at mains terminals:
If mains voltage is too low (
clarify the cause in consultation with
the power supply utility.
Check fan at inverter heat sink. Re-
place inverter if necessary.
No action required
Test coil resistance at compressor. Re-
sistance on all windings must be simi-
lar ( 10 %). For m use a suitable
± Ω
measuring device.
Diagnosis
10 %),
–
151