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technics100 technics100 is offline
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Is the oil supply restricted by a blocked oil filter or a mostly closed
valve?
Is the fuel contaminated with water?
If its tripping the lockout on the burner it will not be the heated water
system which is causing it.
Which make of burner is fitted to the boiler since Trianco use several types
such as Riello, Inter-oil, RDB, Monoflame etc etc. Certainly if you have
already had a new motor, oil pump, and photocell there is a limited number
of possible other alternatives provided the parts fitted were new.
Can you describe exactly what happens step by step from starting to lockout
along with the timing.
As a guide the burner motor should start to rotate, run for a few seconds
driving the fan to purge the combustion chamber clear with fresh air, The
ignition spark will commence and then the oil solenoid valve will open
usually with an audible click. At this point you should hear the flame
ignite. The light of the flame will illuminate the photocell which informs
the sequence control box it is healthy. The ignition spark stops and the
burner continues to run until the thermostat is satisfied or the power is
removed. If no flame light is seen within about 10 seconds the burner stops
and the sequence control goes to lockout. This varies but it will not reset
straight away on most sequence controllers, requiring a few minutes to allow
an internal timer to reset[/quote]


The boiler does everything as you describe and will run from cold until it get hot and then it seems to trip. It trips a transparent box which lights amber, I just press the button in the middle of this box and the light goes out, the boiler starts and runs until it trips again. trips sooner when its hot

I was reading this forum and around the net and thought that the central heating pump wasn't pumping the hot water away from the boiler quick enough thus causing it to trip. I left the boiler on a very low temp setting all day and it has been running fine for approx 14hrs. Is there any way to check the pump, to make sure its pumping at the right speed. its a Grundfos UPS15-50. Any suggestion is appreciated.

cheers