rick wrote:
On 04/11/2016 19:17, Tim+ wrote:
rick wrote:

Does your boiler have a similar system? I suspect that they've all moved
over to "single stage" ignition of the main burner but you never know...

Tim



Single stage I think ... no pilot flame ... just straight electrode for
ignition along with a flame failure detector.


I asked same Q ... on DIYnot forum ........ and have 2 guys who state
this is an obvious fault, simply fixed - known top all (except the 9
Gas Safe Techs who have been to my place presumably) but they are not
prepared to tell me what it is - even though I will not be touching gas
myslef.


Ah, *******. Dontcha just luv 'em? ;-)

Getting back to your boiler one would imagine that it would have a "purge"
phase following a failed ignition to prevent enough gas building up to
cause an explosive ignition. Still makes me wonder if your gas valve is
bypassing gas slightly resulting in gas build up in the combustion chamber
before the next ignition sequence.

It does sound though as if there must be another fault too to explain the
ignition failures.

Tim

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