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My UFH was making a noise as a result of air in the system. On the top floor the manifolds have bottle valves. On releasing the cap, some came out, then it struck me that the cap probably should not be tightened as it is an automatic valve and any air trapped in the valve has to go somewhere...

Any thoughts on how can I check with a multi meter if the fan is faulty on this boiler?

I have a 220 volt single phase table saw with a magnetic switch. There was some suspicion that the switch was faulty as it would start but not run. This happened once before and I cleaned dust from the magnetic switch part and it was OK. I repeated the process and it was OK for a while, then...