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Thanks for the suggestions and comments.....the problem appears solved. I took the very old brown ST699 programmer apart and found two loose solders on the hw side. This could've occurred when trying to remove the unit from the backplate....as the two tangs at the bottom are extremely...

Honeywell but no model number on it. It's beige with a dark brown backplate, the dial is offset slightly to the left and it's the same size as the T6360 . There is a small wiring diagram inside the cover: L > 1, N > 2, N > Load? > 3, N > Load? > 4 (which is switched in the stat to 3 [feed...

Thanks but no wires are dislodged at the stat end and I haven't touched the valve end. The three wires (blue, red and yellow) were put to the same numbererd terminals on the new stat as they were on the old. I've since replaced the old stat and the hot water works ok. Unless I'm unlucky enough...

I picked up a Honeywell T6360 as a replacement for a very tired and tatty looking brown/biege Honeywell thermostat that was in place when I moved in. The old one was wired as follows: Blue to 2, Red to 1 and Yellow to 3. I wired the 6360 the same and whilst the heating works ok my hot water...