Viessmann Vitotronic SPS Service Instructions Manual page 46

Troubleshooting
Overview of fault messages
TID Pp. No. Fault message
11 301 "Sensor outside measuring
range"
12 29 "Sensor outside measuring
range"
13 31 "Sensor outside measuring
range"
14 38 "Sensor outside measuring
range"
15 406 "Sensor outside measuring
range"
16 407 "Sensor outside measuring
range"
17 23 "Sensor outside measuring
range"
18 82 "Sensor outside measuring
range"
19 83 "Sensor outside measuring
range"
20 72 "Sensor outside measuring
range"
22 A "Sensor outside measuring
range"
23 B "Sensor outside measuring
range"
24 C "Sensor outside measuring
range"
25 D "Sensor outside measuring
range"
26 E "Sensor outside measuring
range"
27 F "Sensor outside measuring
range"
28 6 "Sensor outside measuring
range"
46
(cont.)
Effect
The heating circuit pump for
heating circuit 3 remains off.
No DHW heating
No DHW heating
No DHW heating
Temperature maintaining
valve for re-cooling closes
fully (no re-cooling).
No re-cooling
The external heat generator
no longer switches on
The coolant buffer cylinder is
not charged
The coolant buffer cylinder is
not charged
The coolant buffer cylinder is
not charged because the cyl-
inder charging control valve
is closing
The heat pump is turned off
(if fault continues for longer
than 2 minutes)
The heat pump is turned off
(if fault continues for longer
than 2 minutes)
The heat pump is switched
off
The heat pump is switched
off
The heat pump is switched
off
No effect on heat pump func-
tion
Heating water/coolant buffer
cylinder not charged and no
supply to the heating/cooling
circuits
Cause
Flow temperature sensor for
heating circuit 3 or connecting
lead faulty
Lower cylinder temperature
sensor in DHW cylinder or
connecting lead faulty
Upper cylinder temperature
sensor in DHW cylinder or
connecting lead faulty
Heating water flow tempera-
ture sensor in DHW cylinder
or connecting lead faulty
Re-cooler temperature sensor
at brine inlet or connecting
lead faulty
Re-cooler temperature sensor
at brine outlet or connecting
lead faulty
Flow temperature sensor for
external heat generator or
connecting lead faulty
Upper temperature sensor in
coolant buffer cylinder or con-
necting lead faulty
Lower temperature sensor in
coolant buffer cylinder or con-
necting lead faulty
Lower temperature sensor in
coolant system separator out-
let or connecting lead faulty
Suction gas temperature sen-
sor (refrigerant circuit evapo-
rator outlet) or connecting lead
faulty
Temperature sensor in evapo-
rator inlet or connecting lead
faulty
Temperature sensor in evapo-
rator outlet or connecting lead
faulty
Heat pump return temperature
sensor or connecting lead
faulty
Temperature sensor in con-
denser outlet or connecting
lead faulty
Temperature sensor in heat
pump casing or connecting
lead faulty
Outside temperature sensor or
connecting lead faulty