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Yes it was the pump in the end, had a local plumber guy out who diagnosed it whipped the pump off and it felt quite stiff at some points he had a spare in the van. At first he took just the snorkal part off to get to the fan and gave it a spin said it felt stiff took the rest of it apart and...

I unplug the thermistor turn it on and the lights flash to say it's detected a problem, turn it off plug it back in and it's fine for a while. I'm going to get somebody out but fear they will try and say a new boiler.

Also the other problem has come back the CH pump now doesn't run, the DHW is constantly running I think there a problem with the flow detector thermistor.

Yeah it was 4.5uf like the original but it was an unbranded cheap one, which was weird as that seemed to fix it for a while and then slowly it came back not unless a fresh cap gave it a bit of a boost to get going for w while. I have noticed it seems to run for longer when it's cold, it could be...

Thanks Terry, Check the pump or the motor? So the drive dog is the plastic coupling between the motor and the pump right?

Thanks for the reply muggles just caught the lockout in action and it seems to be a previous problem not resolved. It locks out trying to spin the motor up I thought I had fixed this with replacement cap. Granted it was cheapo of equivalent spec but wouldn't think it would have failed that...

Hi all, I have been fixing a few problems with the above boiler for a while now so far they have been easy fixes, motor start cap, photo sensor etc. This one is starting to frustrate me though. So I get a random lockout after minutes hours of running as far as I'm aware the 535se/LD doesn't...