Recent content by michaelcs

  1. M

    Alpha 240 - HW won't heat without CH

    Success! Retested the microswitches and they were indeed fine. Tested CH temperature sensor, also fine. But the DH one proved defective. Impossible to resistance-test it in place because of the angle/location (couldn't be more awkward). Took it off and it was totally dead. New one...
  2. M

    Alpha 240 - HW won't heat without CH

    Agile and gas4you - many thanks for this advice/support. gas4you: yes the DHW green light comes on when DHW demanded, but it doesn't fire up. Agile: I removed the two microswitches and tested them with a bulb and battery (and could also hear each one click as the bulb came on). I don't...
  3. M

    Alpha 240 - HW won't heat without CH

    Help please for a newbie on this forum. For no obvious reason (boiler's been working fine for a good few years) the HW on this Alpha 240 combi will only fire up if CH has been running/heating for at least ten minutes. Otherwise, demanding HW brings up the relevant green light but doesn't...
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