Lennox MLA030S4M Service Manual

128
25. Troubleshooting Indoor Unit Error Codes
Error Code: CP
Description: MWMA models only.
General Note: None.
This S4 jumper is on the adapter
board. There needs to be a
jumper in place . If jumper is
there then make sure it is making
good contact.
Adapter board
located on door
of MWMA unit
The unit will show “CP” if the cap
missing or not making contact.
Need to make sure the two pin to
making contact with the jumper.
The Cap
Adapter board
Error Code: E0
Description: IndoorUnitEEPROMmalfunction.
General Note: PCBmainchipdoesnotreceivefeedbackfromEEPROMchip.
E0
Shutoffthepowersupplyandturniton1min-
utelater.Isitstilldisplayingtheerrorcode?
IftheEEPROMchipissolderedonPCB,re-
placethePCB.Otherwise,checkwhetherthe
EEPROMchipispluggedinPCBproperly?
Yes
Yes
InserttheEEPROMproperly
No
ReplacetheindoorPCB.

Lennox MLA030S4M Specifications

General

Brand	Lennox
Model	MLA030S4M
Category	Air Conditioner
Language	English