Fault Messages On The Display - Viessmann Vitopend 100-W Installation And Service Instructions Manual

Troubleshooting
Function sequence and possible faults
Yes
Burner in opera-
tion

Fault messages on the display

Displayed System characteris-
fault code tics
0A Burner blocked
0C Burner blocked
F2 Burner in a fault
state
36
No
Stops below the set
boiler water tem-
perature and re-
starts immediately
f 2
(cont.)
Faults are indicated by a flashing fault
code (e.g. "F2") and the fault symbol U
on the display.
Cause
Gas supply pres-
sure too low
Mains voltage too
low
The temperature
limiter has respon-
ded
Check the flue sys-
tem for tightness
(flue gas recircula-
tion) and check the
gas flow pressure
Measures
Check the gas pressure
and the gas pressure
switch
Check the power supply
Check heating system fill
level. Check circulation
pump. Vent the system.
Check the temperature
limiter (see page 40)
and connecting cables.
To reset, briefly turn rotary
selector "tr" clockwise
as far as it will go and then
back again.