Water hammer due to zone valve closing

DP

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If Honeywell valve bangs, change it for one that has a paddle instead of ball mechanism
 
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They wont have been fitted the wrong way round , they were probably the right way round, then when your installer fitted the new boiler they swapped the flow and return around as it was easier for them so now the zone valves are the wrong way round

Possibly, but the pump must have been reversed.
A pic would be useful
 
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