Viessmann VITOTRONIC 200 Service Instructions Manual page 177

Refrigerant circuit
(cont.)
Message Meaning
code
34 Evaporation temperature
H
too low
39 Hot gas temperature limit
H
exceeded
3A Safety high pressure
S
switch has responded.
55 Refrigerant loss
H
56 Frost protection, secon-
H
dary circuit
61 Fan faulty
H
80 Max. compressor current
H
exceeded
82 Voltage at inverter too
H
high
83 Voltage at inverter too low Compressor OFF
H
86 Inverter power consump-
H
tion too high
88 Inverter fault
S
8C Communication error
H
8D Short circuit/lead break,
S
inverter temperature sen-
sor
90 Compressor control fault
H
91 Fan fault at inverter heat
S
sink
92 Fan does not reach its set
H
speed.
Heat pump characteris-
tics
Cooling mode:
■
Compressor OFF
Heating mode:
■
Compressor remains in
operation.
Compressor OFF
Compressor OFF
Compressor does not start.
Only in cooling mode:
Compressor OFF
Compressor off: Message
"A9 Heat pump" is shown.
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Measure
Check reversible suction gas tempera-
ture sensor:
Check resistance value (Pt500A) at
connection X25.15/X25.16 of the con-
troller and sensor PCB: See "Control-
ler and sensor PCB".
Check whether the coding card match-
es the heat pump. To check informa-
tion, see "System information".
As for "C9 Refrigerant circ (SHD)":
See "Message overview" for the heat
pump control unit.
Check refrigerant charge.
■
Check refrigerant circuit for leaks.
■
No action required
As for "A9 Heat pump": See "Mes-
sage overview" for the heat pump con-
trol unit.
No action required: Compressor is au-
tomatically reset.
Isolate the inverter from the power
■
supply. Then restore power supply.
Replace inverter if the fault persists.
■
Replace inverter.
Check connecting cable from inver-
■
ter compressor. Replace the con-
—
necting cable if necessary: See
"Connection and wiring diagram".
!
Please note
400 V appliances: An incor-
rect rotating field will irrepara-
bly damage the compressor.
When replacing the connect-
ing cable, ensure the phases
are connected correctly.
Check contactor. Replace inverter if
■
required.
Check fan at inverter heat sink for
leaks (see "Connection and wiring dia-
gram"); clean if necessary.
In the event of recurrence: Have the
refrigerant circuit checked by a refrig-
eration engineer.
Diagnosis
177