12
The pilot burner does not ignite.
The igniter does no spark.
The pilot burner goes out when the ignition
button is released.
The pilot burner does not burn properly.
Light explosions when the burner starts
and delayed ignition.
The main burner does not ignite.
The boiler reaches the set temperature,
but the radiators do not heat up.
The boiler pressure relief valve opens often.
−
Make sure the gas inflow is regular and that any air in
the pipes has been eliminated.
−
Make sure the hole of the pilot nozzle is not blocked.
−
Check ignition operations.
−
Replace the faulty piezoelectric igniter.
−
The electrode is misplaced or must be replaced if
broken.
−
Make sure there is no false contact between terminal
and igniter cable.
−
Make sure the pilot burner flame covers the thermo-
couple sufficiently.
−
Regulate gas capacity to the pilot.
−
Make sure the split thermocouple terminals are well
fixed to the overheat stat.
−
The overheat stat is faulty and must be replaced.
−
Replace the split thermocouple.
−
Replace the gas valve.
−
Check that the gas pressure is regular.
−
Clean the main air inlet hole of pilot burner.
−
Clean the pilot filter in the gas valve.
−
Make sure the pilot burner flame is not too short.
−
Make sure the boiler exchanger is not too dirty.
−
This means that the flue smoke stat has tripped off
(point 2.9)
−
Make sure power arrives to the gas valve.
−
Replace the electric operator of the valve.
−
Replace the valve.
−
Make sure there are no air bubbles in the system, if so
purge from appropriate air vents.
−
The room stat is too low or must be replaced if faulty.
−
The connections of the room stat are not correct. Make
sure the cables are placed on terminals 1 and 4 of the
boiler terminal board.
−
The circulation pump is blocked, unblock it.
−
The electric winding of the circulation pump is faulty,
replace the pump.
−
Make sure the system cold water pressure is not too
high, follow the suggested values.
−
If the pressure relief valve is faulty, replace it.
−
Check pre-load pressure of the expansion tank.
−
Replace the expansion tank if faulty.
3.10
FAULT FINDING
FAULTS
LIKELY CAUSES AND SOLUTIONS
