Unit installation

45
Faults without fault display
Fault Cause Measure
Combustion fault
through pulsation
Excessive gas
throughput
Adjust gas throughput in accord-
ance with rated boiler heating out-
put.
Too little or too much
air
Adjust gas throughput in accord-
ance with rated boiler heating out-
put.
Condensate banked
up in flue system
Check condensate drain.
Incorrect flue outlet Check flue outlet.
Burner restarts and
switches off after the
safety time has
expired
Cores "L1" and "N" at
the power supply ter-
minals of the control
unit interchanged
Check the power supply and swap
the cores.
CO is formed or burner
is very sooty
Too little or too much
air
Adjust correctly. Check ventilation of
installation room.
Insufficient draught in
flue system
Check flue system.
CO
2
content too low Incorrect setting Check that burner has been adjus-
ted for the correct gas type, and
change gas restrictor if required
(see from page 9).
Adjust burner in accordance with the
details from page 14 .
Excessive flue gas
temperature
Excessive gas
throughput
Adjust gas throughput in accord-
ance with rated boiler heating output
(see supply values, page 66).
Check condition of secondary heat-
ing surfaces of the boiler, and clean
if required.
Whining noises Incorrect CO
2
set-
tings
Adjust burner in accordance with the
details from page 14 .
Troubleshooting
Diagnosis
(cont.)
5692 907 GB