Lennox E0

High

Mini-Split MWM/MPA (Außeneinheit) — Outdoor EEPROM malfunction — main control board is not receiving feedback from the EEPROM chip.

Lennox E0: Outdoor EEPROM malfunction — main control board is not receiving feedback from the EEPROM chip. This fault noticeably affects operation.

Possible causes

EEPROM chip faulty or main control board faulty.

Check steps

Power off and restart 3 minutes later; if it persists, replace the main control board.

Affected parts

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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