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I haven't had the pressure adjusted on the gas valve though so it should be the same as what it always has been. Do you think the injector could be a bit blocked up? What would cause this? Would you say the boiler stat is probably not the cause then?

Hi, I think my boiler thermostat is faulty (called out of calibration)? What happens is the heating takes ages to heat up now, the system is clean though the water is not sludged up at all. How can I check for the boiler thermostat being the cause. The hot water cylinder water seems OK...