Rotex A1 BG Installation And Maintenance Instructions Manual page 51

Malfunction
Burner fan not run- No mains voltage on burner
ning despite burner
demand
Plug connections switching panel PCB or auto-
matic firing are loose
Burner blower defective (bearing has seized)
No gas pressure
Air in the gas line
Gas regulating block not opening
No ignition
Burner starting is hard Start delay due to bad ignition
No ignition Ignition electrodes short circuited
Distance of ignition electrodes too large
Ignition electrodes contaminated or humid
Ignition electrodes burnt out
Insulating body cracked
Ignition transformer defective
Ignition cable defective, flashovers
Automatic firing unit faulty
Loud operating noises Wrong burner setting
Bearing damage on burner fan
Loud, whistling Burner blower bearing defective
mechanical noise
STL switch off Water throughput too low due to air inclusion
Water flow too low due to valves closing too
quickly along the entire heating network
Pump standstill
Storage tank switched off in operation without
hot water storage tank
Flue gas temperature Flue gas temperature too high
sensor switch off
1) See documentation "ROTEX RoCon BF Controller"
Tab. 10-1 Possible faults on the A1
FA ROTEX A1 BGe - 02/2014
Possible cause
10 x Faults and malfunctions
Possible solution
Insert X1 plug on automatic firing until it clicks in place.
Check voltage at the terminals L-N of the X1 plug
Check/ renew fuse.
Check/ insert plug connections
Replace the burner blower.
Inspect the gas connections.
Vent the gas line.
Inspect the plug connection between the safety gas
regulation block valve and the automatic firing and
connect correctly if necessary.
Check the safety gas regulation block (zero pressure
during ignition).
Replacing the safety gas regulation block.
Replace the combustion controller.
See "No ignition" fault
Adjust ignition electrodes
Check starting output and adapt if necessary.
Check the ignition electrodes and adjust or replace if
necessary.
Check ignition electrodes and adjust if necessary.
Clean ignition electrodes, and check burner setting.
Change ignition electrodes
Change ignition electrodes
Replace ignition transformer
Change ignition cable and determine the cause
Replace the combustion controller.
Correct burner setting.
See fault "Loud, whistling mechanical noise".
Replace the burner blower.
Vent system
Use slow closing or timed valves, if needed, install
overflow valve
Check mains and PWM control signal connection,
replace pump if necessary.
Disconnect storage temperature sensor
Switch off storage tank charging circuit
Clean the boiler
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