The most common reason for a furnace pressure switch to keep failing is due to a stuck or ruptured diaphragm inside the casing. A stuck diaphragm will not move to the required draft, while a ruptured diaphragm can cause a flapping noise. Other causes of pressure switch malfunction can include flue obstructions, damaged pressure switch hoses, or water in the pressure switch housing.
It is important to note that only a licensed HVAC technician can accurately determine the cause of the pressure switch failure. While a damaged or malfunctioning pressure switch may be a possibility, it is unsafe to assume that this is the sole cause of the furnace's operational problems. It is necessary to ensure that the furnace venting system is not back drafting before turning on the furnace.
Common problems associated with pressure switch failure include the failure to trigger the gas valve to open, even when the necessary vacuum is present. This can be due to a physically damaged diaphragm or a physical blockage within the pressure switch. In such cases, an HVAC technician will need to repair or replace the pressure switch.
Pressure switches have a limited lifespan, typically around 10 years. If the furnace is older and has not had any previous issues with the pressure switch, it is likely that problems may arise in the near future. Regular furnace maintenance and assessments can help identify aging components, such as pressure switches, and replace them before they fail completely.
The furnace pressure switch is a vital part of the safety system, ensuring that the draft motor is running before allowing gas to flow into the combustion chamber. It detects a vacuum created by the draft motor and triggers a switch on the gas valve to allow gas flow. If the pressure switch does not detect a vacuum, it will not allow gas to enter the combustion chamber.
Back drafting, which is when negative motor pressure causes harmful contaminants to be sucked back inside the home, can be indicated by pressure switch issues. If lukewarm air is coming into the home, back drafting may be the cause. However, it is also possible that the pressure switch has been damaged or reached the end of its lifespan.
In summary, the main reasons for a furnace pressure switch to keep failing include a stuck or ruptured diaphragm, flue obstructions, damaged hoses, or water in the pressure switch housing. It is important to have a licensed HVAC technician assess the specific cause of the failure and ensure the safety of the furnace venting system. Regular maintenance and replacement of aging components can help prevent pressure switch failures and ensure reliable furnace operation.
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