Viessmann VITOTRONIC 200 Service Instructions Manual page 176

Diagnosis
Refrigerant circuit
Message Meaning
code
00 No message
―
01 Short circuit/lead break,
S
air intake temperature
sensor, evaporator (out-
door)
03 Short circuit/lead break,
S
suction gas temperature
sensor
04 Short circuit/lead break,
S
hot gas temperature sen-
sor, compressor (dis-
charged)
05 Short circuit/lead break,
S
high pressure sensor
09 Short circuit/lead break,
S
defrost temperature sen-
sor
10 "Normal" compressor
H
shutdown
15 Jumper adaptor incorrect-
S
ly inserted
17 Compressor blocked
S
20 Condensing pressure too
H
high (control high pres-
sure)
21 Inadequate evaporation
H
pressure (low pressure
fault)
22 Hot gas temperature limit
H
exceeded
24 Compressor failed to start. Compressor OFF
H
28 As for message code "20"
H
2F Min. required evaporation
H
pressure undershot
30 Operating point outside
H
the compressor applica-
tion limits for longer than
max. time
176
(cont.)
Heat pump characteris-
tics
―
Compressor OFF
Compressor OFF
■
Energy statement is not
■
calculated correctly: See
chapter "Diagnosis, Ener-
gy statement".
Cooling mode:
■
Compressor remains in
operation.
Heating mode:
■
Compressor OFF
Compressor OFF
■
Energy statement is not
■
calculated correctly: See
chapter "Diagnosis, Ener-
gy statement".
Cooling mode:
■
Compressor remains in
operation.
Heating mode:
■
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Measure
―
Check resistance value (NTC 15 k
at connection T-SENSOR2 on the
main PCB: See "Main PCB [7] / [7-1]".
Check resistance value (NTC 20 k
at connection T-SENSOR3 on the
main PCB: See "Main PCB [7] / [7-1]".
Check resistance value (NTC 50 k
at connection T-SENSOR2 on the
main PCB: See "Main PCB [7] / [7-1]".
Check current at connection
■
H_PRESS on the main PCB: See
"Main PCB [7] / [7-1]". Take refriger-
ant into account.
Check cable and main PCB.
■
Check resistance value (NTC 20 k
at connection T-SENSOR2 on the
main PCB: See "Main PCB [7] / [7-1]".
No action required
Check if jumper adaptor is correctly
■
inserted.
Turn the outdoor unit off and on
■
again.
No action required; automatic reset of
compressor
As for "D4 Control high pressure":
See "Message overview" for the heat
pump control unit.
As for "D3 Low pressure": See "Mes-
sage overview" for the heat pump con-
trol unit.
Check whether the coding card match-
es the heat pump. To check informa-
tion, see "System information".
No action required; automatic reset of
compressor
Check the low pressure sensor.
■
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.
■
)
Ω
)
Ω
)
Ω
)
Ω