2 blinks
Easy Fix
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
Pressure Switch Stuck Open
Quick Answer
Error code 2 blinks on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: Pressure Switch Stuck Open. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Check the flue and intake pipes for ice, bird nests, or debris blockages
2
Inspect the pressure switch hose for cracks, kinks, or disconnections
3
Verify the inducer motor is running when the furnace starts a heating cycle
4
Clear the condensate drain line of any clogs using compressed air or a wet-dry vacuum
5
Test the pressure switch by measuring the pressure differential with a manometer
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Pressure switch
Pressure switch tubing
Inducer motor assembly
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