Boiler turning off when using the shower

[totalitarian]

I'll give them a call and see how much a cartridge is

 

[petit_pablo]

Tenner says it's the boiler plate heat exchanger.

Shower flow rate will be much less than any tap.

 

[totalitarian]

It's a shower/bath mixer tap. The problem exists on both the tap and shower side of the mixer.

Wouldn't the heat exchanger affect all taps in the house?

 

[gigz]

A lot of showers come with filters, have you any fitted. Try turning shower on and open a hot tap slightly, if there's not enough water coming through the boiler it could overheat, this will keep turning it off, then as it cools it will fire up again.

P.S. Changed loads of plates on duotecs recently, take it out and check for blockages.

 

[transam]

could well be a plate exc issue ? had it a couple times on showers only / bar type thermo showers ? after they had been running for a couple of minutes

try turning HW temp down on combi ? see if it makes any difference ?

 

[totalitarian]

I've turned the boiler temp down but it made no difference. If the it was the boiler plate, why would it only effect the shower in the house?