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Just moved into a new house and the heating doesn't seem to come on unless the hot water is also on. I wonder if the problem may lie with the programmer which is a Honeywell ST699B or is it the 3 port valve?
If I need to replace the programmer can anyone recommend one that would do heating on its own without having to heat up a tank of water.
Thanks
If I need to replace the programmer can anyone recommend one that would do heating on its own without having to heat up a tank of water.
Thanks