HVACopediaLennox · Furnace
11 flashes Pressure switch stuck closed before inducer starts
What the control is telling you
The pressure switch is closed before the inducer is energized, so the control will not start the heat cycle.
Applies to: EL195UHNE furnaces with ignition control 103217-03 or 107163-01 (red LED)
Likely causes
- Pressure switch contacts welded
- Jumper across the switch
- Wiring short
Test and repair steps
- Warning: Never jumper or bypass the pressure switch.
- With the inducer off, check the switch for continuity - it is normally open.
- Check wiring at the 12-pin plug (pin 10 pressure switch in) for shorts.
- Replace the switch if closed with no differential.
Settings for these units
- Filter sizes (filter rack kits) · Lennox EL195UHNE
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Source: Lennox EL195UHNE Unit Information Corp 1801-L1 (rev 04/2024), Table 4 (103217-03) / Table 5 (107163-01) diagnostic codes, p.8-10; Table 2, p.8. Summarized in our own words; check the original manual for your model.
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