02/2011 - Art. Nr. 4200 1027 9501B
25
Servicing
Troubleshooting
Symbol
Observation
Cause
Corrective action
Burner does not start after
thermostatic closure.
No malfunction indicated on the
control and safety unit.
Drop in supply voltage or power
failure.
Control unit malfunction.
Check the cause of the drop in
voltage or the power failure.
Replace the control unit.
No heat requested.
Thermostats defective or
incorrectly adjusted
Adjust the thermostats, replace if
necessary.
The burner starts briefly when
switched on, then switches off and
the red indicator light comes on.
The control unit has intentionally
been manually locked.
Unlock the unit.
Burner does not start.
Air pressure switch: not in rest
position.
Incorrect adjustment
Contact welded
Readjust the pressure switch.
Check the wiring.
Replace the pressure switch.
Burner does not start.
Gas pressure normal
Insufficient gas pressure.
Gas pressure switch wrongly set or
defective
Check the gas lines.
Clean the filter.
Check the gas pressure switch or
replace the compact gas unit.
Malfunction diagnosis and repair
In the event of a malfunction, first check
that the prerequisites for correct
operation are fulfilled:
1. Is there any current?
2. Is there gas pressure?
3. Is the gas shut-off valve open?
4. Are all control and safety devices,
such as the boiler thermostat, low
water detector, limit switches, etc.
correctly set?
If the fault is still present, check that
each of the burner components is
operating.
Important safety components must not
be repaired; these components must be
replaced by parts with the same part
number.
Only use original spare parts.
Switch off the power supply
before carrying out
maintenance or cleaning.
After any work on the system:
• Under normal operating conditions
(doors closed, cover fitted, etc.),
check combustion and check the
individual lines for leaks.
• Record the results in the relevant
documents.
en
Combustion
Control
ltd
