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Blackrock63

I have a Grundfos MQ series domestic pump and it has started cycling on and off. The pressure at the outlet reaches approx 2 bar of pressure and the pump shuts off. The pressure then immediately drops as it overflows out of the Pressure Relief valve. Once the pressure gets to 1.5 bar the pump kicks in and the cycle of off/on starts again and again.

I have today replaced the pressure relief valve and the pump was fine for about an hour and now it has started to go through the same process of dumping water out the pressure relief valve and cycling through the on/off process of getting up to 2 bar and then losing pressure.

Attached is a short video of it happening and a picture of the pump and PRV.

Does anyone have any ideas as to what the issue may be?

Thanks in advance of any help and support you can provide

Blackrock63
 

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Blackrock63

UPDATE: I have managed to sort this issue. It turned out to be a faulty expansion vessel which Dumb& Dumber plumbers had fitted incorrectly. The PRV did keep releasing water for a few days after i replaced the EV but it now seems to hve settled down and everything seems good again
 

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