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I have recently changed my central heating programmer from an ACL Lifestyle LS522 to a Drayton LP522 - as I understand it - a direct replacement. However, my Glowworm economy plus 50FF boiler now fires continuously as if it has a permanent live. The Drayton installation guide simply says...

I have not tried system cleaning yet but I can honestly understand how this problem would have come on so suddenly. Co-incidently, I had a poor service done on this 1 month prior to this problem starting.... I saw the guy taking the front off the boiler so there is a chance that all the muck...

All, My boiler is whilstling loudly also. Can you please advise if you have actioned this cleaning and if it has worked. My problem is described below: When the boiler fires from cold, everything appears to work quietly. I assume therefore that pump and fan are ok. The whilstling is...