Potterton Performa 28 boiler

11 Oct 2017
Reaction score
United Kingdom
Hi All

Any help much appreciated

Have a Potterton Performa 28 boiler

The issue is that we don't get any hot water through the tap.

The Central heating works with green rad LED, with the amber flame LED. When hits temperature amber LED goes off.

When turning on the hot water the rad LED will go off and so does the amber flame LED.
With the hot water tap on and running the green tap LED comes on but the amber flame LED stays off and doesn't reignite.

Tried resetting still the same
Replaced Diaphragm still the same

Any thoughts?????

Many thanks in advance

Hope this makes sense?????
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Can you see if the demand switch is being operated when the water is turned on? Should be near the diaphragm you replaced.
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maybe try short the switch out with the water running for a few seconds to see if it fires up or better still use a multimeter on it to make sure its working
does the pin come out and activate the micro switch on top of valve

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