I have a potterton suprima 50 coventional boiler, with hot water tank, pump and motorised valve set-up. The problem i am getting is that i noticed the central heating was cuttting out before the room temprature was reached. Changed the room thermostat but still the same. After some playing with controls ive found that when i turned the hot water tank thermostat upto 60 the heating cut in and worked fine for a week. Then it happened again and i turned the hot water thermostat upto 70 and it has started working fine again. The hot water tank thermostat was replaced last year. Any ideas
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