10
x
Faults and malfunctions
1) See "ROTEX RoCon BF" controller documentation
Tab. 10-1 Possible faults on the GCU compact
Burner fan not run-
ning despite burner
demand
No mains voltage on burner
●
Insert X1 connector on firing unit until it clicks in place.
●
Check voltage at the terminals L-N of the X1 connector.
●
Check/ renew fuse.
Plug connections on PCB control panel or firing
unit are loose
●
Check/ connect plug connections.
Burner blower defective (bearing has seized)
●
Replace the burner blower.
No gas pressure
●
Inspect the gas connections.
Air in the gas line
●
Vent the gas line.
Gas control block does not open
●
Check plug connections between safety gas control
block and firing unit and connect correctly.
●
Check safety gas control block (zero pressure during
ignition).
●
Replace safety gas control block.
●
Replace the firing unit.
No ignition
●
See malfunction "No ignition".
Burner starting is hard Start delay due to bad ignition
●
Adjust ignition electrodes.
●
Check starting output and adjust as required.
No ignition
Ignition electrodes short circuited
●
Check ignition electrodes, adjust or replace as
required.
Distance of ignition electrodes too large
●
Check ignition electrodes and adjust as required.
Ignition electrodes contaminated or humid
●
Clean ignition electrodes and check burner settings.
Ignition electrodes burnt out
●
Replace ignition electrodes.
Insulating body cracked
●
Replace ignition electrodes.
Ignition transformer defective
●
Replace ignition transformer.
Ignition cable defective, sparking
●
Replace ignition cable and determine cause.
Automatic firing unit faulty
●
Replace the firing unit.
Loud operating noises Wrong burner setting
●
Re-adjust the burner setting.
Bearing damage on burner fan
●
See malfunction "Loudly whistling mechanical noise".
Thermo-acoustics
●
Insert the supply air manifold (see fig. 7-3, item 13) on
the Venturi nozzle.
●
Re-adjust the burner setting.
Loudly whistling
mechanical noise
Burner blower bearing defective
●
Replace the burner blower.
STB switch off
Water throughput too low due to air inclusion
●
Vent system.
Water flow too low due to valves closing too
quickly in the entire heating network
●
Use slow closing or timed valves, if required, install
overflow valve.
Pump down
●
Check mains and PWM control signal connection,
replace pump if required.
Disturbing circulation
noises
Pump pressure too high
Badly balanced heat distribution system
●
Throttle maximum pump output (setting of parameter
[Max Perform Pump] reduce gradually – not below
65%).
1)
●
Carry out hydraulic balancing.
Malfunction
Possible cause
Possible solution
Summary of Contents for GCU compact 315
Page 81: ...13 x Notes 13 Notes...
Page 82: ...13 x Notes...
