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Hi so the hot water has been on normally, and the heating off, and has been off since last winter so possibly valve has failed or stuck?

Yeah now shows S4 normal burner operation but only one rad is hot, closest one to cylinder

Hi will take a pic, just wanted to add, changed d70 setting to 3 heating only and now rads are on in one room only despite trv on in each room

Hi, we have a hot water cylinder upstairs, but not sure what external zone valves are?

Hi we have the s30 status code showing which I think means no send for heating from external controllers. We have a wired honeywell thermostat and 2 channel programmer. I have replaced both, and the PCB and the water sensor has been replaced. We fitted a new pump last year and that seems fine...