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adlplumbing - did you go on any boiler breakdown courses? I would like to go on 1 or 2 but not sure which is a good one or not! ....?

i asked the poster and he said there was power going in from stat/programmer!!

i don't have the manual. how does the boiler fire in Ch mode usually? is there a flow switch??

i would like to, i will apply in a minute actually. i am trying to learn more about boiler breakdown's myself, so it could help possibly?

if power to boiler is ok (have you replaced the link to prove it's not programmer or stat)? - how does this boile rusually fire in C.Heating mode? does it use a flow switch?

of course, sorry to bring it up :oops:

no fault codes shown on display?

adl is the way you mean to do with a coin! :) I was gonna mention that

is there power going to the boiler when heating is demanded?

i think the spark gap must have been too big not too small!

when you select heating does the boiler fire up? I am suspecting not, but just to clarify?

thanks Agile, I appreciate your help. I know the boiler has no diverter valve and as you say the hot water ignition happens when the flow switch operates. In general do a lot of combi's in central heating mode start the igntition from the timeclock/stat ? Do some fire from a primary...

i think some models don't show fault codes/lights with h/w faults like these. I would ask the poster: what flow rate does the hot tap run at when the fault occurs firstly.

sorry, thanks for your reply. My boiler is a worcester Junior (28i). non condensing combi. I was just wondering in general. I know they can vary just wondered what the most common way was.

another option could be (depending on layout etc) - repiping the waste from the leaking appliance, but depends on layout / space etc

on a combi boiler - what activates the central heating ignition sequence? is it a primary flow switch or are there various methods? I was just wondering as we have a combi and with hot water the microswitch when activated starts the ignition sequence. basically when the timer calls for heat...