Lennox

Lennox International

3 field manuals · 15 error codes · 0 guides

Ask about a Lennox
Air ConditionerFurnace Model & serial

Lennox furnaces

Manual · Furnace

80% gas forced-air furnace: field service manual

Non-condensing (about 80% AFUE) induced-draft gas furnaces with hot surface ignition and an integrated control board; metal flue vent

6 components3 common failuresCarrier, Bryant, Payne, Goodman, Amana, Daikin, Trane, American Standard, Lennox, Rheem, Ruud, York, Coleman, Heil, Tempstar, Comfortmaker
Manual · Furnace

90%+ condensing gas furnace: field service manual

High-efficiency condensing furnaces (about 90-98% AFUE) with a secondary heat exchanger, PVC venting and a condensate trap; single-stage, two-stage and modulating

3 components2 common failuresCarrier, Bryant, Goodman, Amana, Daikin, Trane, American Standard, Lennox, Rheem, Ruud, York, Heil, Tempstar
Manual · Furnace

Electric furnace / air handler with heat strips: field service manual

Electric furnaces and air handlers with resistance heat strips, sequencers or relays, and limits/thermal links

3 components3 common failuresGoodman, Carrier, Trane, Rheem, Lennox, York, Nordyne/Intertherm

Error codes

E223 Low pressure switch failed openE228 Pressure switch calibration unsu…E241 Flame sensed out of sequenceE250 Limit switch circuit openE290 Igniter circuit faultE292 Indoor blower cannot startE294 Inducer overcurrentLED1 fast flash / LED2 slow flash Reversed line polarityLED1 fast flash + LED2 fast flash (together) Normal heat operationLED1 off / LED2 slow flash Pressure switch openLED1 on / LED2 on Board failure or miswiringLED1 slow flash / LED2 fast flash Low flame signalLED1 slow flash / LED2 on Primary or secondary limit openLED1 slow flash + LED2 slow flash (together) Power on, no heat callLED1/LED2 alternating slow flash Watchguard lockout

Identify a Lennox

Where's the rating plate?

  • Air Conditioner: Rating data plate (10-character serial).

Reading the model number

Not sourced.

Manufacture date from the serial number

Single source

Since 1973: digits 1-2 = plant, digits 3-4 = year, character 5 = month letter.

EXAMPLE ONLY: 5812Cxxxxx -> plant 58, 2012, month code C.

Single source; month letter chart not found in text.

Product lines by era

Line / seriesApplianceYearsNotes
Merit SeriesAir Conditioner2007– (Saltillo plant)Model pattern: 13ACX*/ML14XC1 (sources differ). Budget tier; single-stage units 13–16 SEER, 1.4–5 tons. Production started 2007 in Saltillo, Mexico.
Elite SeriesAir ConditionercurrentModel pattern: EL16KC1/XC18 (sources differ). Mid tier; warranty varies by model.
Signature CollectionAir ConditionercurrentTop tier (Dave Lennox Signature Collection), up to ~28 SEER.

Official Lennox manuals & support

Brand names identify appliances only. OnCall Tech is not affiliated with or endorsed by Lennox.