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How can I test to see if this cold start stat is u/s or working??

what did you mean by the cold start termostat was open

has anyone know why The unit has been working great up until yesterday-when the we found we had no hot water or heating. We have reset the boiler and now have hot water ,but still NO central heating.Boiler starts up when hot water is drawn-fan kicks in etc!! Checked room thermosat/pump...