LG LMU303HV 30000 BTU Multi F Inverter Heat Pump Owner’s Manual

: June 13, 2024
: LG

Table of Contents

LMU303HV 30000 BTU Multi F Inverter Heat Pump
Distribution:
Subject:
Description:
Information:
Documents / Resources
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

Air Conditioning Technologies
SERNICE TECHNOTE

LMU303HV 30000 BTU Multi F Inverter Heat Pump

STN Number:	64
Date Issued:	October 16, 2023
Action:	Service

Distribution:

☒ LG Applied Representatives ☒ LG Distributors ☒ Contractor/Installers

Subject:

Multi F Software Update (Drain pan heater operation)

Affected Product(s):	Multi Zone Outdoor (Multi F)
Applicable Models:	LMU303HV

LMU363HV
Affected Date(s):| 05/2022 (SN 205) through 11/2022 (SN 211)

Description:

Drain pan heater function logic update.

Information:

In the event that the optional drain pain heater does not consistently provide heat, follow the steps below to update the software.
Multi F outdoor software update procedure:

Confirm equipment information matches affected models
Program software instructions

Confirm affected outdoor unit model number, including inverter printed circuit board part number, are correct before updating software.

LG LMU303HV 30000 BTU Multi F Inverter Heat Pump - Information
1

Outdoor Unit Model Number	Inverter Printed Circuit board Part Number
A4UW30GFA3 (LMV303HV)	EBR30300203
A4UW36GFA3 (LMU363HV)	EBR84691034

Software File Name (Software file is the same for all listed outdoor models) 4_5kW_A4UW36GFA3_A4UW30GFA3_225B_9196040B_221207.hex
Prepare all necessary equipment and tools to upload software
a. Stickwriter
b. Short Key
c. Onboarding software
d. Screwdriver

ODU PCBA Location
Remove side panel

Short key on PCBA (CN_FLASH)
Stickwriter connection on PCBA (CN_LGMV port)

LG LMU303HV 30000 BTU Multi F Inverter Heat Pump - Information
3

1. Stick Writer

LG LMU303HV 30000 BTU Multi F Inverter Heat Pump - Information
4

No.	Name	Explanation
1	Power Switch	Power On/Off Switch (up — power on, down — power off)
2	4Pin dip s/w	Setting of comm. Speed, Verifying or not
3	Confirm button	onboarding SW selection and onboarding start
4	5Pin recharging	5Pin charging terminal for internal battery charging
5	Micro SD card Slot	Micro SD card slot for storing onboarding files and

settings files
6| USB 2.0 port| USB 2.0 port is charging terminal for internal battery charging

After checking firmware Update message, press select button to scroll through firmware options.

Select Model [4_5kW_A4UW36GFA3A4UW30GFA3 225B_9196040B_221207] Press the select button for 5 seconds, the “Model” changes to “Selected”

LG LMU303HV 30000 BTU Multi F Inverter Heat Pump - Information
5

Power Off Air conditioning unit to be updated
(※ If the power is not cut off, the PCB and onboarding JIG can be damaged)
Insert Short key on PCBA (CN_FLASH)
Connect Stickwriter Connection cable on PCBA (CN_LGMV port)
Press the select button once in the selected file of the onboarding stickwriter
The stickwriter displays the onboarding progress status. Confirm the word ”Complete” is displayed after successful onboarding.
Remove Short key and stickwriter Connection cable
Reassemble outdoor unit side panel
Power up outdoor unit
Check the PCB Software version (Using LGMV)
Onboarding process is now complete.

STN 644 – Multi F Software Update (Drain pan heater operation)
©2023 LG Electronics U.S.A., Inc. All rights reserved.

Documents / Resources

| LG LMU303HV 30000 BTU Multi F Inverter Heat Pump [pdf] Owner's Manual
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