Im working on the above boiler.
Fault : while running hot water after about 4 mins burner shuts off, then relights and comes back on.
Its an absolute nightmare getting through to technical but on the 2 occasions i did, i got told the following.
Check for blockage on Primary HE, and then check for sticking non return valve on heating circs to right oif divertor.

I have flushed the Primary HE & Plate HE and both ok although a bit of muck nothing too bad. Cleaned pump as well while it was out.
Removed and cleaned Non return valve which operated nice and smooth.
Still however no luck. One of the tech guys did say Thermistor or board but these are avenues to best avoided until certain.

Anyone with similar experience especially Vokera installers / tech guys would be appreciated.

Neil

I've answered this in the CC

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Dave

www.drlgas.co.uk

having the same problem any help

Usually plate he blocked on system side or as said above non return valve and/or auto bypass

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Dave

www.drlgas.co.uk