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It's the overheat reset

It's on the gas section,it will be a job for a RGI

Try changing the magnet,vaillant part no.17-0295

Sorry, I meant that this model doesn't have a pilot light...

No pilot light,or way to light manually,is there power going to the pump,is it spinning?

Has the potentiometer been left in service mode?

Worcester Part no. 87186805270 pipe discharge condensate

Condensate sump

Thorn got taken over by Myson,which then became Potterton Myson,which then became Baxi Potterton

If its going to be anywhere it will be in the rope seals on the flue hood,contact Baxi who should be able to tell you for sure

Have you pressed reset button? L8 is a fan error,either going to be pcb or the fan faulty

You won't have to turn the mains off

Because the new thermostat is made of plastic it doesn't need to be earthed but the connection is there for joining earths,it won't do anything connected or not

Cut off ther bare ends and use insulation tape

Make sure the power is off!!!

Earth green/yellow,Grey neutral, red common and black calling,so just connect up red and black.

You need to discard earth and neutral,make them safe and connect common and calling into the two connections on your new backplate,it doesn't matter which way round

Meter across orange and brown on the lead going to gas valve and also red and blue.this will confirm if you have the correct voltage at the gas valve.i'm not sure which is which,one set is the pilot solenoid and the other is the main burner solenoid.you should have 230vac at one only,if you have...

The expansion vessel is there to allow for expansion but the system pressure will rise when hot and fall when cool

When you heat water it expands