202
Moderate
Lennox · HVAC Systems (AC, Furnaces & Heat Pumps)
Pressure Switch Stuck Closed
Quick Answer
Error code 202 on your Lennox HVAC Systems (AC, Furnaces & Heat Pumps) means: Pressure Switch Stuck Closed. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Disconnect the pressure switch hose and verify the switch contacts open using a multimeter
2
Check the hose for trapped water and drain if present
3
Verify the correct pressure switch part number for the specific furnace model
4
Replace the pressure switch if contacts remain closed without applied pressure
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Pressure switch
Pressure switch hose
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