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Gas boilers are a common home appliance used to provide hot water and heat to homes. When a gas boiler is not working, it can be a major inconvenience. Fortunately, there are a few steps you can take to troubleshoot and fix the problem. To start, you should check the boiler's power source. Make sure that the boiler is plugged in and that the circuit breaker has not tripped. If the power source is not the issue, then you should check the thermostat. Make sure that the thermostat is set to the desired temperature and that it is properly connected to the boiler. If the thermostat is not the problem, then the next step is to check the gas supply. Make sure that the gas valve is open and that the gas line is connected to the boiler. If the gas supply is not the issue, then you should check the pilot light. The pilot light should be lit and the flame should be blue. If the pilot light is not lit, then you should follow the manufacturer's instructions to relight it. If the pilot light is lit, then the next step is to check the boiler's pressure. The pressure should be within the manufacturer's recommended range. If the pressure is too low, then you should follow the manufacturer's instructions to increase the pressure. If the pressure is too high, then you should follow the manufacturer's instructions to reduce the pressure. If the pressure is within the recommended range, then the next step is to check the boiler's safety valves. The safety valves should be open and the pressure should be within the manufacturer's recommended range. If the safety valves are not open, then you should follow the manufacturer's instructions to open them. If the safety valves are open and the pressure is within the manufacturer's recommended range, then the next step is to check the boiler's heat exchanger. The heat exchanger should be clean and free of debris. If the heat exchanger is not clean, then you should follow the manufacturer's instructions to clean it. If the heat exchanger is clean and the pressure is within the manufacturer's recommended range, then the next step is to check the boiler's controls. Make sure that all of the controls are properly set and that the boiler is in the proper mode. If the controls are not properly set, then you should follow the manufacturer's instructions to set them. If all of the above steps have been taken and the boiler is still not working, then you should contact a professional for assistance. A professional can diagnose and repair any underlying issues that may be causing the problem. Gas boilers are a great way to provide hot water and heat to homes. If your gas boiler is not working, then follow the steps outlined above to troubleshoot and fix the problem. If the problem persists, then contact a professional for assistance.