Oil heating

22 Jun 2016
Reaction score
United Kingdom
Hi guys .Got a heating system with a three port valve controlled by two channel programmer tank stat and room stat.The heating works fine when heating only is selected on the programmer as in the stat will cut it on and off.Hot water works fine when water only is selected it cuts on and off with the tank stat.The problems start when you select heating and hot water at the same time,everything still comes on the water heats up fine and the heating comes on but the stat for the heating will not cut out the result being the rads get to hot
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Post some photos of the wiring. I could understand water not turning off, but not heating not turning off.
Get a sparky and wire your system as a y system you can download a circuit diagram and it should
sort things out

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