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LG
Heating & Cooling Combined Unit

Model # LP121CEM-Y8 Official LG package unit

Here are the diagrams and repair parts for Official LG LP121CEM-Y8 package unit, as well as links to manuals and error code tables, if available.

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Owner’s manual

Model diagram and schematic

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Showing 10 of 48 parts  |
Room Air Conditioner Evaporator Fan Blade 5901A20050A
#9011

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Room air conditioner evaporator fan blade

Part #5901A20050A

$58.19 | 
9% OFF Phone Price : $64.19
In Stock
Central Air Conditioner Run Capacitor 3H00660C
#CZZA

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Central air conditioner run capacitor

Part #3H00660C

$24.09
In Stock
Room Air Conditioner Front Grille 3530A20040B
#5301

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Room air conditioner front grille

Part #3530A20040B

$22.33
In Stock
Knob 4940A30037A
#9400

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Knob

Part #4940A30037A

This item is not returnable
$4.51
In Stock
Room Air Conditioner Transformer 6170A20012A
#1704

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Room air conditioner transformer

Part #6170A20012A

$59.22 | 
9% OFF Phone Price : $65.22
In Stock
Room Air Conditioner Wiring Harness 6631AR2668G
#W663

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Room air conditioner wiring harness

Part #6631AR2668G

$35.96
In Stock
Tube Assembly 5211A24129L
#2113

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Tube assembly

Part #5211A24129L

$44.58
In Stock
Room Air Conditioner Electronic Control Board 6871A10082L
#711B

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Room air conditioner electronic control board

Part #6871A10082L

$105.92
In Stock
Room Air Conditioner Condenser Fan Blade 5901A20051A
#5590

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Room air conditioner condenser fan blade

Part #5901A20051A

$29.98 | 
17% OFF Phone Price : $35.98
In Stock
Case Control 4994A20127B
#9940

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Case control

Part #4994A20127B

$24.09
In Stock

Most common symptoms to help you fix your heating & cooling combined units

Choose a symptom to see related heating and air conditioning system repairs.

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Why is my furnace not blowing hot enough?

Thermostat problem, clogged air filter, burner failure…

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Why isn’t my air conditioner cooling well?

Dirty air filter, clogged condenser coils, low refrigerant charge, faulty compressor…

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Why isn’t my air conditioner cooling?

Thermostat problems, bad compressor/condenser fan capacitor, lack of refrigerant, failed compressor…

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Why won’t my furnace burners won’t stay lit?

Dirty flame sensor, failed flame sensor, damaged burner, bad high limit switch…

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Why won't my air conditioner turn on?

Main causes: errant thermostat settings, lack of electrical power, clogged drain line, wiring failure, control failure.…

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Why won't my furnace turn on?

Main causes: Errant thermostat settings, lack of power, bad interlock switches, lack of exhaust ventilation, wiring fail…

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Most common repair guides to help fix your heating & cooling combined units

These step-by-step repair guides will help you safely fix what’s broken on your HVAC system.

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How to unclog the air conditioner drain line

How to unclog the air conditioner drain line

The condensate drain line for your central air conditioner can clog with mold and mildew. Water will back up and start d…

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Repair difficulty
Time required
 15 minutes or less
How to replace the furnace flame sensor

How to replace the furnace flame sensor

The flame sensor detects when furnace burner flames are lit. You may need to replace the flame sensor if flames only sta…

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Repair difficulty
Time required
 15 minutes or less
How to replace a heating and air conditioning system thermostat

How to replace a heating and air conditioning system thermostat

The control thermostat for your HVAC system can stop working. This repair guide shows how to replace it.…

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Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your heating & cooling combined units

Use the advice and tips in these articles and videos to get the most out of your HVAC system.

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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

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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