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Mitsubishi
Central Air Conditioner

Model # MUM18EW Official Mitsubishi split-type air conditioner

Here are the diagrams and repair parts for Official Mitsubishi MUM18EW split-type air conditioner, as well as links to manuals and error code tables, if available.

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Error Codes

Model diagram and schematic

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Showing 10 of 23 parts  |
Liqud Vlv T2W460662
#17

Main assy diagram

Liqud vlv

Part #T2W460662

The manufacturer no longer makes this part, and there's no substitute part

Terminal Block T2W800375
#10

Main assy diagram

Terminal block

Part #T2W800375

The manufacturer no longer makes this part, and there's no substitute part

Gas Valve T2W460661
#16

Main assy diagram

Gas valve

Part #T2W460661

The manufacturer no longer makes this part, and there's no substitute part

Cabinet T2W462232
#2

Main assy diagram

Cabinet

Part #T2W462232

The manufacturer no longer makes this part, and there's no substitute part

Chrge Plug T2W457641
#14

Main assy diagram

Chrge plug

Part #T2W457641

The manufacturer no longer makes this part, and there's no substitute part

Base T2W739290
#23

Main assy diagram

Base

Part #T2W739290

The manufacturer no longer makes this part, and there's no substitute part

Prplr Blde R01093115
#7

Main assy diagram

Prplr blde

Part #R01093115

The manufacturer no longer makes this part, and there's no substitute part

Outdoor Te M21534375
#21

Main assy diagram

Outdoor te

Part #M21534375

The manufacturer no longer makes this part, and there's no substitute part

Mt Exchnge T2W466630
#13

Main assy diagram

Mt exchnge

Part #T2W466630

The manufacturer no longer makes this part, and there's no substitute part

Mgntc Cntrt T2W382342
#1

Main assy diagram

Mgntc cntrt

Part #T2W382342

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for window air conditioners

Choose a symptom to see related window air conditioner repairs.

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Why your window AC compressor is not turning on?

Main causes: bad compressor, lack of refrigerant, bad compressor start relay, electronic control board failure…

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Why won't water draining from my window air conditioner?

Main causes: clogged drain hole, air conditioner not leveled properly…

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Why is water leaking into the house from my window air conditioner?

Main causes: clogged condensate drain, air conditioner not leveled properly, leaky window air seals …

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Why are my window air conditioner's evaporator fins iced up?

Main causes: dirty air filter, air conditioner is too small for the room, temperature set too cold, control failure…

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Why does my window air conditioner's compressor hum but not work?

Main causes: turning the air conditioner off and the back on too quickly, dirty or restricted condenser coil, compressor…

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Why won't my window air conditioner start?

Main causes: lack of electrical power, bad electronic control board, wiring failure, bad temperature sensor…

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Repair guides for window air conditioners

These step-by-step repair guides will help you safely fix what’s broken on your window air conditioner.

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How to replace a window air conditioner ambient thermistor

How to replace a window air conditioner ambient thermistor

If your window air conditioner isn’t cooling properly, it might need a new ambient thermistor. You can replace it yourse…

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Repair difficulty
Time required
 45 minutes or less
How to replace a window air conditioner condenser fan

How to replace a window air conditioner condenser fan

If the condenser fan blade is broken or the condenser fan motor won’t run, you can replace the broken parts yourself by…

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Repair difficulty
Time required
 90 minutes or less
How to replace a window air conditioner electronic control board

How to replace a window air conditioner electronic control board

The electronic control board is the brain of your window air conditioner. Here’s how to replace it.…

Read more
Repair difficulty
Time required
 45 minutes or less

Effective articles & videos to help repair your central air conditioners

Use the advice and tips in these articles and videos to get the most out of your window air conditioner.

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Maintaining your air conditioner

Maintaining your air conditioner

Learn how to maintain your central air conditioner to keep it running smoothly all summer long.…

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How to prevent the 2 most common AC failures from ruining your summer

How to prevent the 2 most common AC failures from ruining your summer

Get tips to help keep your central AC running all summer long…

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Top questions about Sears and Sears PartsDirect

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