Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 96
Air source heat pump, monoblock version for heating and cooling operation, with 1 integrated heating/cooling circuit
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Also See for VITOCAL 151-A:
- Operating instructions for the system user (60 pages) ,
- Manual (24 pages)
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Troubleshooting
Fault messages
(cont.)
Message code
System characteristics
F.1
The heat pump is switched
off.
F.2
The heat pump is switched
off.
F.3
No defrost
■
No room cooling
■
F.4
No defrost
■
No room cooling
■
F.7
Only room heating
■
No DHW heating
■
F.8
Only room heating
■
No DHW heating
■
F.13
An outside temperature value
of 0 °C is used to calculate
the set flow temperature.
96
Cause
Lead break, flow tempera-
ture sensor, secondary cir-
cuit / heating/cooling cir-
cuit 1
Short circuit, flow temper-
ature sensor, secondary
circuit / heating/cooling
circuit 1
Lead break, secondary
circuit return temperature
sensor
Short circuit, secondary
circuit return temperature
sensor
Lead break, cylinder tem-
perature sensor
Short circuit, cylinder tem-
perature sensor
Lead break, outside tem-
perature sensor
Measures
Check resistance value
(NTC 10 k
) at connec-
Ω
tion X4.1/X4.2 of the EHCU elec-
tronics module. Replace sensor if
required.
Check resistance value
(NTC 10 k
) at connec-
Ω
tion X4.1/X4.2 of the EHCU elec-
tronics module. Replace sensor if
required.
Check resistance value
(NTC 10 k
) at connec-
Ω
tion X4.3/X4.4 of the EHCU elec-
tronics module. Replace sensor if
required.
Check resistance value
(NTC 10 k
) at connec-
Ω
tion X4.3/X4.4 of the EHCU elec-
tronics module. Replace sensor if
required.
Check resistance value
(NTC 10 k
). Replace sensor if re-
Ω
quired.
Wall mounted indoor unit:
■
Connection on the underside of
the appliance to 6-pole connec-
tion socket on the right, termi-
nals 9 and 10.
Floorstanding indoor unit:
■
Connection at plug 5 on the
HPMU electronics module
Check resistance value
(NTC 10 k
). Replace sensor if re-
Ω
quired.
Wall mounted indoor unit:
■
Connection on the underside of
the appliance to 6-pole connec-
tion socket on the right, termi-
nals 9 and 10.
Floorstanding indoor unit:
■
Connection at plug 5 on the
HPMU electronics module
Check resistance value
(NTC 10 k
). Replace sensor if re-
Ω
quired.
Wall mounted indoor unit:
■
Connection on the underside of
the appliance to 6-pole connec-
tion socket on the right, termi-
nals 11 and 12.
Floorstanding indoor unit:
■
Connection at luster terminals for
sensors, terminal 5 and 6
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