We have just changed a pump. Though it would spin much of the time, it appears there was a 'flat spot' on it from which, if it came to rest on that, it could not restart.
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5 years ago
Heating no circulation
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5 years ago
If it's a grundfos pump they occasionally shear the shaft and while the end of the shaft under the top plug spins the impeller doesn't. Don't know what make of motorised valve you have but seizure of the spindle can and does a happen. Also some models permit removal of the top plate without removal from the pipework. Just beware losing the o ring seal.
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5 years ago
that 2nd bit's handy to know!
NT