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  1. B

    Grundfos MQ 3-35 0.55kW Boost Pump- has packed in can I still have heat??

    My faithful old Grundfos MQ 3-35 0.55kW Boost Pump has seized up, my own fault and I have to wait a few days for a new one. Same model so should be able to fix it myself. In the meantime I have a closed CH system and occasionally I hear booster come on when heating is on, its only for a brief...
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    IS A 22M 2 PORT MOTORISED VALVE SAME SIZE REGARDLESS OF MAKE

    I am having hassle with my CH and unfortunately I have a drayton motorised valve on the CH part and a RANGE in the HOT PRESS controlling the DHW part. Last Monday when I turned on the CH and later turned on the DHW only the rads got warm as well and I could not shut down the boiler, only way...
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