If the pump was the only thing changed before the noise started then it can only be pump fitted the wrong way round or a worn out 3 way valve . Could also need the bypass opening a little if there is one .
After changing the pump we had a water hammer, only obvious a few months in when both CH and HW were on and CH call went off. The pump is and was fitted in the correct orientation - same arrow direction as the old one.
The change that cured the problem was me changing pump modes - the UPS3 has about 7 modes to play with.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local
