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Bertiebob

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We have a 9 yr old Heatslave 18/25 that's been regularly serviced. Heating was on in the morning but failed in the evening. My son is Gas safe engineer and suggested trying a few things before calling our usual engineer.
He disconnected the twin channel control panel and put in link's so it is always on. Took wire for thermostat out and put a link in. None of this started the heating. The diverter head was manually locked and this got the heating working. The lever returned to A when off. This was fine for a day but the same happened again. Does this mean the actuator head should be changed or is it the valve itself or something else altogether. I have contacted my usual engineer but he is on holiday.
 

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