The gas boiler reset button is a crucial safety feature that shuts down the boiler when it exceeds the maximum suggested temperature, preventing the circuit breaker from tripping. However, when this button keeps tripping, it can be a frustrating and potentially dangerous issue that requires immediate attention. In this comprehensive guide, we’ll explore the common causes of this problem and provide step-by-step solutions to help you get your gas boiler back in working order.
Causes of Tripping
1. Blocked or Closed Gas Valves
One of the most common reasons for the gas boiler reset button to keep tripping is a blockage or closure of the gas valves. Ensure that all gas valves are fully open and not obstructed in any way. A blocked or partially closed gas valve can prevent the proper flow of gas, leading to issues with the boiler’s operation and triggering the reset button.
2. Burner Problems
Issues with the burner can also cause the reset button to trip. This can include problems with the high voltage ignition transformer, dirty or plugged fuel filters, or fuel gelling/delivery issues. Inspect the burner components and ensure they are clean, functioning correctly, and receiving the appropriate fuel supply.
3. Overheating
Poor ventilation around the boiler can lead to overheating, which in turn triggers the reset button. Ensure that the boiler has adequate airflow and that the air filters are clean. The recommended airflow for a typical residential gas boiler is between 300 and 400 cubic feet per minute (CFM). Anything less can result in overheating and the reset button tripping.
4. Lack of Fuel
If the boiler runs out of fuel, the reset button will trip as a safety measure. Regularly check the fuel levels and refill the tank or cylinder as needed to prevent this issue.
5. Faulty Flame Sensor
A malfunctioning flame sensor can also cause the reset button to trip. The flame sensor is responsible for detecting the presence of a flame and signaling the control board to continue the boiler’s operation. If the sensor is dirty, damaged, or not functioning correctly, it can trigger the reset button. Ensure the flame sensor is clean and free from debris.
Solutions
1. Check and Clean Air Filters
Regularly clean or replace the air filters to ensure proper airflow and prevent overheating. Dirty or clogged filters can restrict the necessary airflow, leading to the boiler overheating and the reset button tripping.
2. Inspect and Clean the Flame Sensor
Carefully inspect the flame sensor and clean it with a soft cloth or emery paper to remove any debris or buildup. This will help ensure the sensor is functioning correctly and not causing the reset button to trip.
3. Check Fuel Levels and Refill
Monitor the fuel levels in the tank or cylinder and refill as necessary to prevent the boiler from running out of fuel, which can trigger the reset button.
4. Ensure Proper Ventilation
Verify that the boiler has adequate ventilation and airflow around it. Ensure there are no obstructions or blockages that could impede the necessary airflow, leading to overheating and the reset button tripping.
5. Seek Professional Assistance
If the issue persists or you are unsure of the underlying cause, it’s best to consult a professional HVAC technician. They can thoroughly inspect the boiler, diagnose the problem, and provide the necessary repairs or maintenance to resolve the reset button tripping issue.
Technical Specifications
Reset Button Function
The reset button is a safety feature that shuts down the boiler when it exceeds the maximum suggested temperature, typically around 200°F (93°C). This prevents the circuit breaker from tripping and helps protect the boiler from potential damage due to overheating.
Common Locations
The reset button is usually found in the blower compartment near the blower motor and is identified by its distinct red or yellow color. It is often labeled as the “High Limit Switch” or “Safety Limit Switch.”
DIY Steps
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Confirm Pilot Light Status: Before attempting to reset the boiler, ensure that the pilot light is lit. If the pilot light is out, relight it according to the manufacturer’s instructions.
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Turn Down Thermostat: Lower the thermostat setting to minimize heat generation and reduce the strain on the boiler.
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Turn Off Power and Fuel: Switch off the power to the boiler from the circuit breaker and shut off the fuel supply.
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Relight Pilot Light: If the pilot light was out, relight it following the manufacturer’s instructions.
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Hold Reset Button: Press and hold the reset button for at least 30 seconds to ensure the boiler resets properly.
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Restore Power and Fuel: Turn the power back on from the circuit breaker and open the fuel supply.
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Monitor and Adjust: Closely monitor the boiler’s performance and make any necessary adjustments to prevent future tripping of the reset button.
Remember, safety should always be the top priority when working with gas-powered appliances. If you are unsure or uncomfortable performing any of these steps, it’s best to consult a professional HVAC technician.
Reference
- https://www.bestownerdirect.com/how-do-i-stop-my-heater-from-tripping-the-reset-switch
- https://www.doityourself.com/forum/boilers-home-heating-steam-hot-water-systems/589106-hitting-reset-button-becoming-norm.html
- https://completecomfortgo.com/furnace-wont-stop-running/