FieldBench
Lennox codes

Lennox

E225

Lockout

High PS failed OPEN

High-fire prove failed.

Walk E225 in Diagnose

5 plates — walk the one on the cabinet

First check

1 Prove the high-fire call

Write the live Lennox EL195NE code before you pull power. Confirm this IFC is actually commanded to high — W2 at the board, or the staging timer has expired. Does the inducer actually go high?

Expect: R to W2 ~24 VAC (conventional) or a high-stage request on a communicating stat.

If fail: No high request → thermostat / staging / menu. Not a high-fire pressure switch.

If pass: Go to step 2. Do not jump the high-fire switch to ‘see if it runs.’

The rest of the walkthrough is Diagnose.

On the plates

  • Does the inducer actually go high?
  • High-fire hose not teed to the low switch. Vent capacity on 110/135 kBtu cabinets.
  • Inducer actually high? High hose on the high tap only.
  • Inducer actually high? Common vent / wind / liner. High hose not teed to the low switch.

Plates that use E225