MCB tripping intermittently

[Buck Taylor]

house 3 years old
Tripping MCB intermittently in the last 6 months
Grundfos STN 3.0

I have also posted this on the electricians forum and advised that our water friends could maybe help out.

The mains water supply comes into the kitchen from the street and then goes up to the water tank in the loft via a PRV which I have changed and fitted a non return valve on the hot tap side. However, the MCB for the pump is tripping intermittently when and only when I use the tap in the kitchen which is a mono mixer tap. I have also renewed the tap in the kitchen.
Any help/advice would be appreciated.
Thanks

 

[Buck Taylor]

Gents, many thanks for all your input regarding the MCB tripping intermittently. I m sure to have rectified the cause, which does not make sense.

The inlet strainer on the hot side was very badly blocked with debris, so not sure why the pump didn't trip from all other outlets?
Confused??? Me too, happy days!
Thanks again