Viessmann Vitotwin 300-W - Page 132

132
Fault mes-
sage
Cause Remedy Re-
set-
ting
"298: False
flame Eng
bu"
The Eng burner ionisation
electrode has detected a
faulty flame.
Check the gas supply. Check
gas type setting (see
page 66).
Check electrodes (see
page 73).
Check function of gas train
and ignition transformer.
Check balanced flue system.
Ensure that flue gases are
not being recirculated.
If the fault has not been rec-
tified, replace the control unit
PCB (see page 138).
AR
"299: False
flame supp
bu"
The auxiliary burner ionisa-
tion electrode has detected a
faulty flame.
"300: Eng
head undert
SW"
Stirling head control temper-
ature too low.
Check thermocouple cables.
If the fault has not been rec-
tified, replace the control unit
PCB (see page 138).
UR
Troubleshooting
Fault messages
(cont.)
5618 294 GB