FieldBench
Lennox codes

Lennox

E203

Lockout

Appliance capacity not programmed

Unit size code is blank or invalid after a new IFC.

Walk E203 in Diagnose

2 plates — walk the one on the cabinet

First check

1 Read the plug / card on THIS cabinet

On Lennox EL195NE the model plug or shared-data card must match this cabinet size. A 100 kBtu plug in an 80 cabinet overfires and limits. A leftover memory card after a control swap throws d0/d4-class codes. This is a P-menu job, not a bad motor. Program size, then retest.

Expect: Plug / card part matches the rating plate and the replacement control bulletin.

The rest of the walkthrough is Diagnose.

On the plates

  • This is a P-menu job, not a bad motor. Program size, then retest.
  • Remove the stat from the bus if iComfort is fighting the program cycle.

Plates that use E203