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Many thanks, Will get this setup, did not want to guess and cause further problems.

We have a problem with our Y plan heating, the programmer is a Honeywell ST699, running a Main 24 Heat ERP boiler. The 3 port valve which had been sticking was replaced spring 2025 with a ESI 3 port Zone. The heating will work by itself as will the hot water. But using the 2 timer period the...