Viessmann VITOTRONIC 200 Service Instructions Manual page 168

Diagnosis
Refrigerant circuit
Message Meaning
code
55 Too little refrigerant
H
56 Condenser frost risk
H
59 Electronic expansion
S
valve faulty
5D Insufficient hot gas super-
H
heating
69 Calculation error, refriger-
S
ant circuit
6A Primary inlet temperature
H
(brine inlet) too low
6B Primary inlet temperature
H
(brine inlet) too high
6C Secondary circuit flow
H
temperature too high
6D Room cooling:
H
Secondary circuit flow
temperature too low
6F Vitocal 333-G:
H
Compressor speed below
min. speed for 90 s
70 S Short circuit/lead break,
secondary circuit flow
temperature sensor down-
stream of instantaneous
heating water heater
71 Short circuit/lead break,
S
secondary circuit return
temperature sensor
80 Vitocal 333-G:
H
Max. compressor current
exceeded
168
(cont.)
Heat pump characteris-
tics
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Compressor does not start. As for "CB Flow temp. primary": See
Compressor does not start. Check primary circuit.
Compressor does not start. If necessary, check the set tempera-
Compressor does not start. Check parameter settings for cooling
Compressor OFF
Compressor OFF
Compressor OFF
Compressor OFF
Measure
Check amount of refrigerant. Adjust
the amount of refrigerant if necessary.
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
■
sensor in the secondary circuit: See
"Controller and sensor PCB".
Check amount of refrigerant. Adjust
■
the amount of refrigerant if necessa-
ry.
Check temperature sensors in the
■
refrigerant circuit: See "EEV PCB
[4-6] / [4-7]".
Check plug at connection J7: See
■
"EEV PCB [4-6] / [4-7]".
Check stepper motor of electronic
■
expansion valve.
Check hot gas temperature sensor:
See message code "04".
No action required: Compressor starts
up again.
"Message overview" for the heat pump
control unit.
tures of all heat sources in the heating
system. Adjust the set temperatures if
necessary.
("71xx"), e.g. "Min. flow temperature
cooling 7103".
Check refrigerant circuit controller soft-
ware version: See chapter "System in-
formation".
Check resistance value (NTC 10 k
at connection J21 (T2) of the EEV
PCB: See "EEV PCB [4-6] / [4-7]".
Check resistance value (NTC 10 k
at connection J21 (T3) of the EEV
PCB: See "EEV PCB [4-6] / [4-7]".
Test coil resistance at compressor. Re-
sistance on all windings must be simi-
lar ( 10 %). For m use a suitable
± Ω
measuring device.
)
Ω
)
Ω