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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...- michaelcs
- Post #7
- Forum: Plumbing and Central Heating
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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...- michaelcs
- Post #4
- Forum: Plumbing and Central Heating
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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...- michaelcs
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- Replies: 7
- Forum: Plumbing and Central Heating