promax 28 he a, intermittent e133 fault

[rikpal]

problem only occurs on central heating, replaced spark probes already as slightly bent, correct voltage from board to spark generator 190v Dc, signal from flame proving probe fine. heating fires up initialy but once at temperature does not cut back in, will do if you run dhw flame then stays on. overheat stat also ok(ie no resistance when cold
any sugestions greatly received as to how to test components,thinking either gas valve or board but would like to know for sure.

Thanks

 

[Billy Bob Bob]

http://www.ukplumbersforums.co.uk/central-heating-forum/42241-notice-gas-safety-related-advice.html

are you?

 

[rikpal]

yes iam gas safe registered, spent last 2 years servicing and lgsr checks on social housing contracts, now becoming more involved with break downs and repairs, want to be able to identify problem rather than just fit parts until sorted. Have found this forum very useful in the past so finaly decide to join, may even be able to help others out?

 

[Dotty]

Be glad of that mate, can you build your post count up to 10+ posts then send your gsr details to Gasman, Redsaw or Mr Doberman to gain access to the gsr engineers only section? Ta very!