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Why gas boiler is not switched off? The boiler water temperature is exceeded and does not correspond to a given temperature scale, the gas boiler is boiling, but continues to burn.The gas boiler is not turned off when set temperature. The reason for all the faulty bellows - bulb. How to replace the bellows - the bulb of the thermostat of the gas boiler automation eurosit 630 with their hands. Look video on repair and setup.