Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 100

Troubleshooting
Fault messages
(cont.)
Message code System characteristics
F.117 Refrigerant circuit off
F.118 Refrigerant circuit off
F.123 Refrigerant circuit off
F.124 Refrigerant circuit off
F.147 Refrigerant circuit off
F.148 Refrigerant circuit off
F.149 The refrigerant circuit is con-
trolled with the replacement
value.
F.150 The refrigerant circuit is con-
trolled with the replacement
value.
F.151 Refrigerant circuit off
F.152 Refrigerant circuit off
F.155 The refrigerant circuit is
locked.
100
Cause
Lead break, evaporator
suction gas temperature
sensor
Short circuit, evaporator
suction gas temperature
sensor
Lead break, liquid gas
temperature sensor, con-
denser
Short circuit, liquid gas
temperature sensor, con-
denser
Lead break, compressor
suction gas temperature
sensor
Short circuit, compressor
suction gas temperature
sensor
Lead break, liquid gas
temperature sensor, cool-
ing
Short circuit, liquid gas
temperature sensor, cool-
ing
Lead break, hot gas tem-
perature sensor
Short circuit, hot gas tem-
perature sensor
Fault, electronic expan-
sion valve 1
Measures
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X20.5/X20.6 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X20.5/X20.6 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X15.1/X15.2 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X15.1/X15.2 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X14.7/X14.8 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X14.7/X14.8 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X16.1/X16.2 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X16.1/X16.2 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X14.9/X14.10 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X14.9/X14.10 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check electronic expansion
valve 1. Replace expansion valve if
required.