02/2011 - Art. Nr. 4200 1027 9501B
26
Symbol
Observation
Cause
Corrective action
Burner blower starts up.
Burner does not start.
Air pressure switch: Contact does
not close.
Readjust the pressure switch.
Check the wiring.
Replace the pressure switch.
Burner blower starts up.
Burner does not start.
Flaring during pre-ventilation or
pre-ignition.
Check the valve. Check flame
monitoring.
The burner starts, the ignition
switches on, then failure
No flame at the end of the safety
time.
Gas throughput set incorrectly.
Malfunction in flame monitoring
system
Incorrect polarisation (live/neutral
position) of the power supply on
the 7P connector/socket
No ignition sparks.
Electrode(s) short-circuited.
Ignition cable(s) damaged or
defective.
Igniter defective.
Control and safety unit
Solenoid valves do not open.
Valves jamming.
Adjust the gas flow stage Check
the condition and position of the
ionisation probe in relation to earth.
Check the condition and
connections of the ionisation circuit
(cables and measurement bridge).
Check that the polarisation of the
7P connector is correct.
Adjust, clean or replace the
electrodes.
Connect or replace the cable(s).
Replace the igniter.
Replace the control unit.
Check the cabling between the
control unit and external
components.
Replace the compact gas unit.
Replace the valves.
The burner switches off during
operation.
Air pressure switch: contact opens
during start-up or during operation.
Flame failure during operation.
Adjust or replace the pressure
switch.
Check the ionisation probe circuit
Check or replace the control and
safety unit.
Servomotor fault
Clogging of the air flap
Locking of the air flap
Internal fault with the servomotor
Replace the servomotor
Servicing
Troubleshooting
Combustion
Control
ltd
