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Hi D_Hailsham, Thank you for your reply and advice. I'm sorry that I wasted everyone's time, and mine, for I had a huge brain fart... :oops: There is luckily nothing wrong with my system and the re-wiring is correct. Bright Spark here set the timing on the programmer incorrectly... :roll...

Hi all, I had a problem with my Glow-Worm Fuelsaver F boiler that didn’t want to switch off. I checked the Honeywell L641A hot water cylinder thermostat and noticed that the small switch inside had seized. I immediately replaced the thermostat and wired it exactly as the old one. But after...