Boiler cuts intermitently

[Nigel Day]

Hi,

I have an ideal response 120 boiler that has just developed a fault of the burner light quitting then re-igniting totaly at random times. This happens both in the hot water and heating modes,

could it be faulty pcb or flame detector (both replaced 9 months ago similar prob) or should i look elsewhere ?

any help much appreciated.

nige

[John]

Check the temperature sensors, also the flame sensor is dry (no leaks of water ingress)

[Nigel Day]

Thanks john.

as i said the problem is intermitant, i wonder if its a sign of temp sensor failure?

cheers.

[John]

I was thinking moisture in the connection(s) - sometimes visible I have had an occasion where a Response started weeping water into the heat exchanger (internal corrosion) then it caused condensation within the casing

[Nigel Day]

on examining the burner assembly, ignitor and flame detector there doesnt appear to be any moisture and no damage but signs of some corrosion (brown deposits). where would you suggest i look?

hope you dont mind all the questions:)

thanks again

[Mr Fizzion]

You switched on the "keep hot" feature? :-)

[John]

SNIP

Without seeing the deposits its not easy to say but it could be they are showing some lower than expected resistance and upsetting the flame rectification detector. Geoff might be able to offer some input here?

[Nigel Day]

would if i could :)