Viessmann VITOTRONIC 200 Service Instructions Manual page 160

Diagnosis
Refrigerant circuit
Message Meaning
code
0E Short circuit/lead break,
S
suction gas temperature
sensor (downstream of
evaporator)
10 Compressor has stopped.
H
13 Communication error
S
15 Inverter and compressor
S
incompatible
18 Compressor fault (general
S
message)
1E EEV PCB faulty
S
1F Parameter "Output com-
—
pressor stage 5030" not
set correctly
20 Condensing pressure too
H
high (control high pres-
sure)
21 Inadequate evaporation
H
pressure (low pressure
fault)
22 Excessively high hot gas
H
temperature
24 Compressor failed to start:
S
Message "88" has occur-
red 3 times successively.
26 Max. defrost time excee-
H
ded
33 Central heating/DHW
H
heating:
Secondary circuit flow
temperature too low
160
(cont.)
Heat pump characteris-
tics
Compressor OFF
Compressor OFF
Compressor OFF
Subject to other messages
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Defrost is terminated early.
Compressor remains in op-
eration, but does not re-
start.
Measure
Check resistance value (NTC 10 k
at connection J13 (T7) of the EEV
PCB: See "EEV PCB [4-3] / [4-4]".
No action required
Check the electrical connection be-
tween the refrigerant circuit controller
and the inverter.
Check whether the coding card match-
es the heat pump. To check informa-
tion, see "System information".
See further messages regarding the
compressor and inverter (message
code "80" and above).
Replace EEV PCB.
Set "Output compressor stage
5030" according to the type plate.
Then switch off the heat pump control
unit. Wait 1 min. Then restart the heat
pump control unit.
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.
Have a specialist check the com-
■
pressor parameters ("5xxx").
Check whether the coding card
■
matches the heat pump. To check in-
formation, see "System information".
Check compressor drive.
■
Check inverter.
■
Check setting of "Evaporator tem-
■
perature for defrost end 5010".
Set to factory settings if necessary.
Check function of 4-way diverter
■
valve: See "Actuator test".
Check hydraulics in the secondary
■
circuit, e.g. whether all shut-off
valves are fully open.
Check secondary circuit flow rate.
■
Check flow and return temperature
■
in the secondary circuit.
Check flow and return temperature
■
sensor in the secondary circuit.
Check amount of refrigerant. Adjust
■
the amount of refrigerant if necessa-
ry.
Check temperature sensors in the
■
refrigerant circuit.
)
Ω