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It does sound like the aps is switching alot, but I've already had this checked out and replaced.

It's been reaching everywhere until this morning when everything was luke warm . The intermitent off/on of the main burner has increased suddenly so this is the reason it wasn't heating up this morning.

wired directly back to the boiler I mean!

wired directly back to the boiler I mean!

yes pump is running freely and it is wired directly back to the boiler. But it shouldn't be, should it?

I had an engineer around who fitted a new air pressure switch and PCB cost a fortune! didn't fix this problem and then told me I needed a new boiler the next day on the phone.

fully pumped

yes the fans running ok

I've already changed the stat so I'm sure it's not that. I had a heavy duty fernox cleanser in it for 5 days then flushed it really well. Could this have somehow blocked the heat exchanger up? Have I shot myself in the foot!

My boiler fires up and runs fine for 3mins then main burner keeps tripping off and on fairly rapidly but pilot stays on. This has been going on for some time but this morning it just got so bad it isn't heating up the rads or water. Could this be a blocked heat exchanger?! Should I get shot...