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    Suprima 50 cutting out - NOT locking out - buzzing relay?

    I have a 4 1/2 year old Potterton Suprima 50 which does not lock out but sometimes will not fire on demand from the central heating (Hot water demand brings the boiler on though). I've checked the room thermostat / tank thermostat and all appears fine at that end, however, I've noticed a...
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