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Hi mate. Thanks for your interest. As far as I know I don't have any zone valves just (I assume) a fairly typical set up of condensing boiler, quite new, very old fashioned looking RANDALL 4033 mechanical style programmer for ch and hot water, hot water storage in tank in airing cupboard with...

Good evening to all. I am trying to replace my old Drayton electro mechanical dial stat with a new digital programmable Philex stat but making little headway. The old stat had 5 connections as in the diag. The new stat only requires two connections. I have tried connecting yellow and each red...

Thermostat Diags