Fault Codes / Lennox / EE

Lennox EE

High

Mini-Split MWM/MPA (Inneneinheit) — Indoor Unit EEPROM malfunction.

Lennox EE: Indoor Unit EEPROM malfunction. This fault noticeably affects operation.

Possible causes

EEPROM chip faulty or indoor main control board faulty.

Check steps

Restart power; if it persists, replace the main control board.

Affected parts

Inneneinheit-Hauptplatine

Safety note

Isolate power before testing.

Source: Lennox Mini-Split Systems Service Manual — Indoor and Outdoor Unit Error Codes (Corp. 1816-L7, 2018), "Extended Reference Guide - Outdoor Unit Error Codes" §4 and "Indoor Unit Error Codes" §5

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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