1. The thermostat
The thermostat measures the temperature inside a building and if it is different from the preset temperature it ignites the boiler or furnace to produce heat. The problems with the thermostat will prevent the boiler or furnace to ignite or maybe the thermostat can’t calculate the temperature anymore. The solving solution is to replace the thermostat.
2. Pilot light or gas issue
Gas is the fuel used in many furnaces and boilers. The problems with gas can be: the pilot light burns out or the gas jets or burners are clogged. This will stop the gas supply in the system. For the pilot light problem, you will need to restart it, as for the clogs you will require assistance from a professional to clean the jets or burners.
3. Thermocouple
This is a safety device that detects if the temperature of the pilot light is too low and closes the gas valve to prevent gas buildup or explosions. d the light goes out or sputters. This prevents gas buildup and potential explosions. A damaged thermocouple will close the valve even if the pilot light still burns. In this case you will need to replace it.
4. Clogged Filter
The system that circulates the air uses an air filter to block dust and other contaminants. In time, this filter can get clogged therefore blocking the air access through the system. The correction is simple: replace the filter.
5. Valves
Boiler systems have valves that open and close while water passes through the pipes. When these valves get stuck the water won’t pass anymore and the heat produced will be fewer. To solve the problem you can gently tap them with a hammer and add some oil on them.
