39
Which message will be triggered at the heat pump
control unit depends on the type of message at the
refrigerant circuit controller.
Type of message at the re-
frigerant circuit controller
Message of the heat
pump control unit
H
"Note"
"07 Fault refrigerant
circ"
S
"Fault"
"05 Fault refrigerant
circ"
Message
code
Meaning
Heat pump characteris-
tics
Measure
00
―
No message
―
―
03
S
Short circuit/lead break
suction gas temperature
sensor
■
Compressor OFF
■
Energy statement is not
calculated correctly (see
chapter "Diagnosis, Ener-
gy statement").
Check resistance value (Pt500A) at
the sensor connection of the EEV
PCB: See "EEV PCB
[1]
". Replace
sensor if required.
04
S
Short circuit/lead break
hot gas temperature sen-
sor
■
Compressor remains in
operation.
■
Energy statement is not
calculated correctly (see
chapter "Diagnosis, Ener-
gy statement").
Check resistance value (Pt500A) at
the sensor connection of the EEV
PCB: See "EEV PCB
[1]
". Replace
sensor if required.
05
S
Short circuit/lead break,
high pressure sensor
Check current at sensor connection of
EEV PCB: See "EEV PCB
[1]
". Take
refrigerant into account. Replace sen-
sor if required.
06
S
Short circuit/lead break
liquid gas temperature
sensor
Check resistance value (Pt500A) at
the sensor connection of the EEV
PCB: See "EEV PCB
[1]
". Replace
sensor if required.
0A
S
Short circuit/lead break,
low pressure sensor
■
Compressor OFF
■
Energy statement is not
calculated correctly (see
chapter "Diagnosis, Ener-
gy statement").
Check current at sensor connection of
EEV PCB: See "EEV PCB
[1]
". Take
refrigerant into account. Replace sen-
sor if required.
0E
S
Short circuit/lead break
hot gas temperature sen-
sor
Compressor OFF
Check resistance value (Pt500A) at
the sensor connection of the EEV
PCB: See "EEV PCB
[1]
". Replace
sensor if required.
10
H
"Normal" compressor
shutdown
Compressor OFF
No action required
1F
―
Refrigerant circuit configu-
ration fault: Fault due to
impermissible combination
of refrigerant circuit pa-
rameters. The refrigerant
circuit controller has suf-
fered a serious fault.
Compressor OFF
■
Check compressor parameters
(
"50.."
).
■
Check whether the coding card
matches the heat pump. For scan-
ning, see "System information".
20
H
Hot gas temperature limit
exceeded
Compressor OFF
21
H
Evaporation pressure too
low (low pressure fault)
Compressor OFF
As for
"D3 low pressure"
: See "Mes-
sage overview" for the heat pump con-
trol unit.
22
H
Condensing pressure too
high (control high pres-
sure)
Compressor OFF
As for
"D4 Control high pressure"
:
See "Message overview" for the heat
pump control unit.
Diagnosis
Refrigerant circuit
(cont.)
5800 917 GB
Diagnosis