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servowarm elite 50 not ignighting

Joined
9 May 2008
Messages
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Location
Sussex
Country
United Kingdom
I have a 15 year old servowarm elite 50 boiler that has a curious fault. It works fine on the hot water cycle, but will not switch on the central heating. The timer box clicks and makes he right noises but does not fire the boiler. The system does not have a room stat toinetrupt the signal. I tried another timer unit but did not fix the fault. If anyone has an idea it would be apreciated. thanks...
 
What type of mzv(motorized valve),is it the old servowarm type,that's got to be moved manually or is it a 2 port honeywell valve
 
We used the Unishare SD1701 3port valves.

Could be that or the energy manager if fitted
 

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