no hot water, only when c/h on

Joined
8 Feb 2012
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Location
Cumbria
Country
United Kingdom
Hello
Worcester heatslave 9.24

I can only get hot water when the c/h is on, the burners will not ignite otherwise.

I think maybe the diaphragm in the flow switch?

Its been a few years since I last played with a boiler, but I did have some knowledge and training although a little hazy now.

Can I check this via multimeter? and if so what do I turn the tester on to, iv got diagrams of wiring so I know where to put my prongs.

My service engineer two years ago told me I would maybe need a new boiler in a few years, but I'm thinking of selling the house and would like to fix, cheaply.

I will not attempt the work myself as I know the job will be a nightmare as to how its situated but will make all our life's easier if I could phone him with diagnostics.

Thank you for your Time
 
Diaphragm worn and not moving far enough to activate microswitch
 

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