Britony II T gas water heater 'hunting'

[JohnHother]

When a hot water tap is opened, everything is fine. When a shower is used, there isn't enough flow to keep the water heater happy, and after a minute or so it turns off its burner and waits for a minute while the hot water runs cold, then turns the burner back on and repeats that cycle endlessly. If a hot water tap is half open at the same time as the shower is used, everything is fine - the water heater runs continuously.

Please advise what may wrong with the water heater and how it can be fixed. I have fitted a new diaphragm and stripped the lower half of the gas valve (below the diaphragm) to no avail.

 

[ShaunCorbs]

Are you gas safe registered??

 

[JohnHother]

Are you gas safe registered??

No, I'm just a chartered professional engineer, but I have a good friend who is fully qualified in that respect, so whenever it's anything to do with gas, he does the hands-on part and I just watch. Do you have any actual advice to offer ?

 

[Chalked]

Yep
Don't mess with it.

 

[heliotrope]

This is an open forum and regardless of whether or not you
are gas safe registered then boiler repair or gas related advice
cannot be given for safety reasons.

There is a sub forum here that registered gas operatives can join
for discussions and advice of this type.

 

[ShaunCorbs]

@Lou maybe a close upto you tho

 

[Lou]

Sorry guys, GSR talk in the GSR forum..

If you don't have access and have more than ten forum posts then PM me with your credentials and I can sort it for you.

Thanks