Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 103

Repairs
(cont.)
wT qW/qE 2/3/4/5
wI
wW
wP
wQ
wE
qO
1 Wiring chamber
2 Safety high pressure switch
High pressure 1 (Stage 1)
3 Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Safety high pressure switch
High pressure 2 (Stage 2)
4 High pressure sensor EEV 1
(Stage 1)
5 Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
High pressure sensor EEV 2
(Stage 2)
6 Suction gas temperature sensor
EEV 1 (Stage 1)
7 Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Suction gas temperature sensor
EEV 2 (Stage 2)
8 Low pressure sensor EEV 1
(Stage 1)
9 Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Low pressure sensor EEV 2
(Stage 2)
qP Liquid gas temperature sensor
EEV 1 (Stage 1)
8/9
qQ Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Liquid gas temperature sensor
EEV 2 (Stage 2)
qW Electronic expansion valve EEV 1
(Stage 1)
qE Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Electronic expansion valve EEV 2
(Stage 2)
qR Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Hot gas temperature sensor EEV 2/
Compressor 2 (Stage 2)
qT Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
Compressor 2 (Stage 2)
qZ Hot gas temperature sensor EEV 1/
Compressor 1 (Stage 1)
qU Compressor 1 (Stage 1)
qI Sight glass, oil level Compressor 1
and 2
qO Secondary circuit return tempera-
ture sensor
Only type WW 302.A125,
WW 302.A155, WW 302.A200,
WW 302.A250, WW 302.A300:
2 return temperature sensors, sec-
ondary circuit
wP Filter dryer
Troubleshooting
103