Baxi boiler - heating works, not water - help please!

[monkeytaylor]

Hi,

I have a Baxi 80 HE Plus Combi boiler, fitted a couple of years ago and serviced each year. Over the past few months the red light started coming on - when reset it worked fine.

During the recent service the engineer fiddled about - replaced wiring - and said if there's still a problem it may be the PCB that needs replacing.

Since he came it's actually got worse: it seems to work fine if the water and heating are on together, but if I just put the water on the red light comes on after about 15 mins, and the reset doesn't solve it - I have to wait half an hour for the boiler to completely shut down / cool down before the water will work again by itself.

Does this sound like a PCB problem? The quote to replace it is expensive so I wanted to get some advice before shelling out.

 

[Rob]

It sounds like the combustion door seals have gone and its tripping the stat hence why you need to wait so long because its cooling down before working for a little while again.

The LEDs are an indication of what sort of fault it is. Have you checked what the manual states the fault as?

 

[bengasman]

It could be a diverter problem not letting the heat dissipate outside the boiler.

 

[Agile]

Since it works OK when heating and HW are on then I wonder if it might be an overheating problem perhaps caused by a temperature sensor being faulty or out of position.

Tony

 

[Adi1530]

Sounds like the com box door seals have gone.
Also check the sump seals.