Viessmann VITOTRONIC 200 Service Instructions Manual page 175

Refrigerant circuit
(cont.)
Message Meaning
code
67 Flow switch has respon-
S
ded.
68 Communication between
S
controller PCB and EEV
PCB is faulty
86 Motor overload relay or
H
safety equipment at the
soft starter has respon-
ded.
Message history
Message history of the refrigerant circuit controller
(status and fault information):
Messages cannot be acknowledged in the message
■
history.
■ Messages are listed in chronological order. The most
recent message is listed first.
■ Up to 30 entries are stored.
1. Service menu:
Press OK + simultaneously and hold for
å
approx. 4 s.
2. "Diagnosis"
3. "Refrigerant circuit"
4. "Message history"
Message overview
Note
Some faults should only be remedied by a (specialist)
heating contractor certified for heat pumps by
Viessmann.
Heat pump characteris-
tics
Both compressors OFF
Both compressors OFF
Compressor blocked for
4 min
[7] / [7-1]
Measure
Check secondary circuit flow rate.
■
Check secondary pump.
■
Test voltage at the controller PCB con-
nection: See "Controller PCB and EEV
PCB [6]".
0 V: Flow switch has responded.
■
230 V~: Flow switch has not respon-
■
ded.
Check connecting cable between
■
controller PCB and EEV PCB. Re-
place the connecting lead if neces-
sary.
Replace EEV PCB.
■
Replace controller PCB.
■
No action required
A B
Message history
0 09.09.2009 17:16:00
1 09.09.2009 17:16:01
2 09.09.2009 17:16:02
3 09.09.2009 17:16:03
Back with
Fig. 39
Message number
A
Date and time of the last occurrence
B
2-digit message code
C
Type of message: "Note" or "Fault"
D
Frequency of occurrence
E
Refrigerant circuit controller messages can trigger a
message at the heat pump control unit (see "Message
overview"). Which message will be triggered at the
heat pump control unit depends on the type of mes-
sage at the refrigerant circuit controller.
Type of message at re-
frigerant circuit control-
ler
"Note"
H
"Fault"
S
Diagnosis
C D E
06 Fault 7
0A Fault 3
03 Note 11
10
Fault
1
Message at heat pump
control unit
"07 Message refrig. circ"
"05 Fault refrig. circ"
175