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    main combi 30 he timer wiring problems

    i have a main combi 30 he with no timer fitted, i bought a timer and wired it in as follows live and neutral to terminals 1 and 2 the 2 blacks to terminals 3 and 4 and nothing on terminal 5 But the heating is not coming on, i have hot water. i can hear the switch clicking but the heating...
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