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Boiler comes on fan runs but no ignition. - Heating & Cooling

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Bad igniter or bad gas valve. Try replacing the igniter 1st.

Posted on Aug 01, 2008

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Posted on Jan 02, 2017

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1 Answer

How do I fix a problem with my boiler not coming on?


Ive just resolved this issue on my own boiler...... Its the programmer ,replace it as the micro switch has gone , when it comes on the lights only come on the internal switch does not ,so no sognal to boiler , replace programmer

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Exhaust and fan motor run, but why won't furnace ignite?


Are you referring to the combustion blower on your furnace? Cause if you are then maybe this answer will help. The hose coming from the inducer blower may have holes, and or the safety pressure switch is not working.

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I have a baxi combi boiler which wont start and trips the electric..plumber has changed fan,ignition and now pcb to no effect...help!


Start by diconnecting main supply to Boiler (at the boiler input) and see if it trips the electric. This would point to fault in wiring from board to boiler.
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Boiler won't light you here fan kick in then light comes up red on b can anyone help please?


First try to ignite the pilot light yourself. Instructions for igniting your boiler can be found in your boiler's manual or sometimes in the inside door of the boiler. If your boiler's pilot light won't ignite, you either have a gas supply problem or you'll need to call in a Gas Safe Register approved engineer for a repair.for details click

Nov 24, 2012 | Heating & Cooling

1 Answer

I've got a Alpha 240 e combi boiler..... Everything seems to be wor,kin ok but it won't start the ignition sequence .


could be air presure switch which tells pcb that fan is working and would then bring inn ignition system then main gas valve.Would suggest getting gas engineer in.pommie engineer

May 26, 2012 | Water Heaters

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My dad has a valliant boiler VP4 ZE15 IT IS AROUND 3 YEARS OLD IT ISNOT IGNITING I HAVE TURNED PRESSURE UP AND HELD THE BUTTON IN FOR A MINUTE. i CANNOT FIND WHWERE THE RESET BUTTON IS TO TRY THIS PLEASE...


Turn the power off at the wall , wait 60 seconds and the boiler will automatically reset.

Modern boilers are complex re safety and the boiler will only start if the exhaust fan is running and is up to speed .

The vacuum caused by the fan trips a switch and allows ignition to continue

If the pilot light does not come on it does not warm up the thermocouple which turns on the main gas valve.

If you go to the Valliant website they will supply you with a user guide

Sep 28, 2009 | Water Heaters

1 Answer

Fan runs continuously


the air pressure which does not controll the fan it is a safe guard for the gas/oil burner to ignite nowing that the fan is running ( air switch normaly negative /positive prssure n/o,n/c circuits. it could be that your boiler is designed for a cant think of techinacal name but when in centre of house/factory and has 1 or more boilers connected to flue etc the fans run when only power to boiler is on , non vented system ? it could be a simple link to remove in controll panel i would phone technical help for manufacture ?

Jan 31, 2009 | Water Heaters

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Boiler Problem


what do you mean "moved the position" of the boiler?

May 25, 2008 | Heating & Cooling

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