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    HSA3 way valve or room thermostat problem? Help

    I have an oil fired central heating system aprox 18 years old. it consists of a Myson 50/60 boiler Potterton EP6000 programmer with a PTT2 tank thermostat control fitted alongside, Potterton PRT 2 room thermostat and an HSA3 motorised valve in the tank cupboard upstairs. Boiler has recently...
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