Fault Messages - Viessmann Vitotron 100 Series Installation And Operating Instructions Manual

Fault messages

If a fault occurs in the boiler, the message "Err" will be displayed on the main function screen. Press the rotary
switch to display a list of faults.
Symbol
NO PRESSURE
TEMP SENSOR FAULT Tpcb
TEMP SENSOR FAULT Tout
TEMP SENSOR FAULT Tin
TEMP SENSOR FAULT Thw
TEMP SENSOR FAULT Tr
TEMP SENSOR FAULT Tos
PUMP FAULT PO
LOW BATTERY POWER
Table 4. Fault messages
Description
Low pressure in heating circuit
Temperature sensors on PCB are
faulty
Flow temperature sensor faulty
Return temperature sensor faulty
DHW cylinder temperature sensor
faulty
Room temperature sensor faulty
Outside temperature sensor faulty
Faulty pump
Low battery power on PCB MSK.80
Installation sequence
Possible causes
– Pressure below 0.6 bar
– Pressure sensor faulty
– PCB MSK.80 faulty
– PCB MSK.80 faulty
– Tout sensor faulty
– PCB MSK.80 faulty
– Tin sensor faulty
– PCB MSK.80 faulty
– Tcyl sensor faulty
– PCB MSK.80 faulty
– Tr sensor faulty
– PCB MSK.80 faulty
– Tos sensor faulty
– PCB MSK.80 faulty
– Pump faulty
– Faulty fuse on PCB MSK.80
– PCB MSK.80 faulty
– Low battery power on PCB
MSK.80
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