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What does pressure switch open mean on furnace?

What does pressure switch open mean on furnace?

Another common issue associated with a furnace pressure switch stuck open is when the hose is clogged or disconnected. The pressure switch hose is used to detect if the inducer motor is working properly. When the hose is damaged, clogged, or detached, the pressure switch can stay in the OPEN position.

What do I do if my pressure switch is stuck open?

How to Fix a Pressure Switch that is Stuck Open

  1. Inspect the pressure switch.
  2. Reset the Integrated Furnace Control unit (IFC)
  3. Check for blockage in venting.
  4. Inspect the hose/suction tube.
  5. Check the drain line.
  6. Replace the inducer motor.
  7. Call a HVAC expert.

Are furnace pressure switches normally open?

The pressure switch is a normally open switch that closes upon the manufacturer’s specifications for required negative pressure. If the inducer turns on and is working normally, the furnace pressure switch should activate. There’s no time lag on this either. The inducer motor creates this draft quickly.

What is a furnace pressure switch?

A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced-air furnace. It is a round-shaped switch that is fairly easy to identify once you have removed your furnace’s front cover.

How do you troubleshoot a pressure switch on a furnace?

The first thing that you should do when troubleshooting a pressure switch is to test for continuity across its terminals. To test for continuity across the pressure switch, follow these steps: Turn off power to your furnace and open its access panel. Disconnect the two wires from the pressure switch.

Why is my furnace pressure switch stuck open?

The #1 reason for a pressure switch to be stuck open is blockage in the furnace exhaust vent. Blockage in the exhaust vent will prevent a furnace from heating, or shut it down completely. Here are a few common sources of blockage in an exhaust vent:

What is a pressure switch on a vent fan?

In a nutshell, the pressure switch is a verification that the inducer (combustion fan) is on and that the vent is clear. If the vent is restricted or the inducer motor does not come on, the pressure switch will not work.

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