Ign cycling

Bamba · 6 Mar 2005

Boiler is Sime Friendly Format (Combi)
Problem is boiler lights then goes out then lights and so on, radiators get nice and warm; water is not as hot as it used to be.
Changed thermocoulple, thermistor, limit sensor, overheat sensor, and frost stat, checked air switch, anyone got any ideas.

ChrisR · 6 Mar 2005

Yep, Find out how the boiler works and stop guessing!
How much £ have you spent!?

kevplumb · 6 Mar 2005

spent that much on a guess

ChrisR · 7 Mar 2005

How long does it stay alight and is it the same on HW as CH?

Bamba · 7 Mar 2005

Yes, it's the same on HW and CH, however I have noticed the fault disappears when lit from cold, once it has warmed up the cycling begins.

Bamba · 8 Mar 2005

Yes, it affects CH and DHW.

DarkInferno · 9 Mar 2005

incorrectly positioned/faulty flame sensor / broken lead

Bamba · 9 Mar 2005

I have now noticed the boiler works perfectly when the time kicks in in the morning that is until I use the hot water then the cycling begins. Could this be a fault with the diverter valve?

Thanks in advance.

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Ign cycling

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