21
Pegasus F2
9. FAULT FINDING
Fault
Cause and Corrective Action
After a few startup attempts,
The pilot burner is clogged or dirty.
the electronic control unit fails to
ignite the boiler
Check that the gas flow to the boiler is normal and that air
in the pipes has been removed.
Check that the electrodes are in their correct position and
free from scales (see fig. 9).
Make sure the boiler is connected to the power supply
and is well earthed.
Check that the pilot gas valve is powered up.
Check the connections to the detection and spark elec-
trodes.
At startup, there is no electric
Check that the electrodes are in their right
discharge between the electrodes
position and free from scales.
Regulating thermostat is set too low.
Check the power supply.
Check the connections to the electronic control unit.
Make sure the NEUTRAL-PHASE connections have not
been reversed and the earth connection is effective.
Check incoming gas pressure and make sure the gas
pressure switch is open.
Reset the Flue gas safety thermostat.
Reset the safety thermostat.
No pilot ignition
No or little gas
Air is held in the pipes.
Vent it as described in the chapter on startup.
Pilot injector is clogged or dirty.
Clean the injector with compressed air.
Poor pilot flame
Pilot injector is dirty.
Poor main burner flame:
Gas valve filter is dirty.
too high, too low or too yellow
Check that gas pressure at the burner is normal (see table
3 paragraph 2.02).
Injectors are dirty.
Smell of unburnt gas
Check the boiler is clean.
Check that draft is sufficient.
Check that gas consumption is not excessive.
No rise in temperature
Make sure the regulating thermostat works.
while the boiler is working
Check that gas consumption is not below specifications.
Summary of Contents for PEGASUS F2 102
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