A furnace pressure switch is a safety device found near a gas forced-air furnace's draft-inductor motor. It will not allow the furnace to operate unless the proper venting air pressure is present. Once the front cover of the furnace is removed, the round-shaped switch is pretty straightforward to locate.
A furnace's pressure switch may fail or become stuck in the open position, and you may perform a few basic tests before testing the switch for electrical failure. A multi-meter is required to test the switch itself. Seek professional assistance or furnace repair in Queens if you feel the need.
How the Draft Inducer and Pressure Switch Work
The draft-inhibitor is a blower that circulates combustion air through the heat exchanger of the furnace (s). The pressure switch detects the correct amount of negative pressure and activates (closes the circuit) to turn off the furnace. If the furnace fails and the pressure switch is not installed, exhaust gases might enter the living space.
A failure to turn on a pressure switch might be caused by a variety of issues, including:
- Draft inducer motor failure
- Restricted intake air vent
- Restricted combustion air vent
- Leaks around assemblies
- Clogged condensate drainage
- Pressure switch electrical failure
Opt for professional expertise for furnace repair in Staten Island to resolve the issues.
Types of Pressure Switches
Depending on the kind of furnace, the furnace pressure switch may have a varied design:
- In a single-stage conventional furnace, the body of the draft inducer fan is connected to one pressure switch and one hose.
- One pressure switch on a single-stage condensing furnace includes two hoses, one for detecting pressure at the draught inducer/burner enclosure and the other for sensing correct venting pressure at the condensate collecting box.
- Two pressure switches may be used in two-stage furnaces, while three pressure switches may be used in modulating furnaces.
What You'll Need
Equipment / Tools
- Screwdrivers
- Flashlight
- Multi-meter
Materials
- Pressure switch hose (if needed)
Instructions
- Turn off the Power
- Inspect the Pressure Switch Hose
- Check for Obstructions in the Hose
- Check the Hose Port
- Inspect the Furnace Cover
- Look for Vent Blockage
- Test the Switch for Resistance
- Test the Furnace Operation
Refer to the Trane furnace troubleshooting guide for better understanding.
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