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My Ravenheat 820/20 makes a loud sharp pop or bang after the CH has been on and is cooling doen. I think it may be the Diverter Valve sticking? No problems with heating or HW but when a bath has been run the pilot goes out after HW is stopped...? Connected~??

I have a Ravenheat Combi (came with the house). Although well kept and serviced has a problem when running a bath. After running hot water for a few minutes and then shutting it off the pilot is extinguished after about 60 secs with a definite mechanical noise as if something has sprung out. i...

It seems like water is leaking from the bath tap under the base where it sits on the bath (the seal). What causes this? How do I fix it please??