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i have, whatever i turn it to it doesnt turn the heating on

i think so

As title, i have a ideal classic boiler with honeywell t6360 thermostat and a honeywell ST699 controller, when i set the heating to constant it doesn't come on, as it doesn't when set to timed, but the light does ?, if i switch the hot water on however then it comes on fine no problems ? hope...