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Tried blowing it clear and no joy. I've taken it apart, and the bit that seems blocked is the bit between the safety valve and the pump - it's a one way valve to stop pressure from the boiler forcing water back into the pump (I'm assuming).
Replacement pump should sort it, and I can't put it back together anyway as I'll need threadlocker to seal the thread connecting the pump to safety valve.
On that note - what do people use as a food safe thread sealer?
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Nef
Descale again? Sometimes descaling can loosen scale and it blocks shit.
Also, did you drain it or something? You might need to prime the pump if it's sucking air - I have a small syringe that I'd force water up the inlet with (although it's now on ultrasonic cleaning degreaser removal duties so I can't use it further).