Viessmann MatriX radiant burner Service Instructions Manual page 31

Diagnostics
(cont.)
Faults without fault display
Fault
Combustion errors
through pulsation
Burner repeatedly starts
and stops after safety
time
CO is formed or burner is
very sooty
CO content too low
2
Flue gas temperature too
high
Cause
Gas throughput too high Adjust gas throughput
Too little or too much air rated boiler output
Condensate backup in
flue gas system
Flue gas draught
incorrect
Cores L 1 and N at
control unit mains
supply interchanged
Too little or too much air Correct setting.
Insufficient chimney
draught
Incorrect setting
Gas throughput too high Adjust gas throughput
Troubleshooting
Remedy
in accordance with
Checking condensate
drain
Check flue gas draught
Check mains supply and
swap cores
Check boiler room
ventilation.
Check flue gas system
Adjust nozzle pressure
in accordance with type
of gas used.
Check whether burner
has been adjusted to
correct gas type and
change gas restrictor, if
necessary.
in accordance with
rated boiler output.
Check conditions of
secondary heating
surfaces of boiler and
clean, if necessary.
31