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Lennox MWMA012S4-*P - User Manual

Lennox MWMA012S4-*P
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1
MINI-SPLIT SYSTEMS SERVICE MANUAL
CORP1602-L9
3/2017
Supersedes 10/2016
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss
of life.
Installation and service must be performed by a licensed professional HVAC installer (or equivalent) or service agency

Table of Contents

Other manuals for Lennox MWMA012S4-*P

Preview: Installation Instructions
Installation Instructions28 pages

Questions and Answers

  • S
    Stephanie DominguezAug 20, 2025
    What to do if my Lennox Air Conditioner shows an outdoor EEPROM malfunction?
    • J
      Jennifer StricklandAug 20, 2025
      If your Lennox Air Conditioner displays an outdoor EEPROM malfunction, try these steps: * Power off the unit, then restart it after 3 minutes. * If the issue persists, the outdoor main PCB may need to be replaced.
  • K
    Kendra MaysAug 22, 2025
    What to do if my Lennox MWMA012S4-*P has low refrigerant?
    • S
      Samantha ClarkeAug 22, 2025
      If your Lennox Air Conditioner has low refrigerant, add refrigerant according to system specifications.
  • S
    Steven RobbinsAug 25, 2025
    What to do if my Lennox Air Conditioner has high or low voltage protection error?
    • P
      Preston CareyAug 25, 2025
      If your Lennox Air Conditioner displays a high or low voltage protection error, verify the voltage supply levels and correct if required.
  • D
    Derek GibsonAug 27, 2025
    How to fix communication error between indoor and outdoor unit in Lennox MWMA012S4-*P?
    • R
      Raymond HernandezAug 27, 2025
      To address a communication error between the indoor and outdoor units of your Lennox Air Conditioner, check the communication wiring and connections.
  • A
    Alfred MartinezAug 28, 2025
    What to do if my Lennox MWMA012S4-*P has a high water level alarm?
    • J
      John RodriguezAug 28, 2025
      If your Lennox Air Conditioner is showing a high water level alarm, clear any blockage from the drain system.
  • Z
    Zachary Stout PhDAug 30, 2025
    How to reset outdoor current overload on Lennox MWMA012S4-*P?
    • C
      christopher65Aug 30, 2025
      If your Lennox Air Conditioner senses an outdoor current overload, reset the overload protection if it has tripped.
  • Z
    zsmithAug 31, 2025
    How to troubleshoot indoor fan speed error on Lennox MWMA012S4-*P?
    • N
      Nancy BarberAug 31, 2025
      To troubleshoot an indoor fan speed error on your Lennox Air Conditioner, inspect the fan and motor for proper operation.
  • A
    amartinezSep 2, 2025
    What to do if my Lennox MWMA012S4-*P shows an outdoor unit fan speed error?
    • D
      davisdavidSep 3, 2025
      If your Lennox Air Conditioner displays an outdoor unit fan speed error, check the fan for operational issues.
  • A
    angelalongSep 4, 2025
    How to fix compressor drive error in Lennox MWMA012S4-*P Air Conditioner?
    • S
      Scott GonzalezSep 4, 2025
      To fix a compressor drive error in your Lennox Air Conditioner, inspect the compressor and associated drive components.
  • J
    James GallagherSep 6, 2025
    What to do for compressor pressure switch issues in Lennox MWMA012S4-*P Air Conditioner?
    • J
      John HughesSep 6, 2025
      If your Lennox Air Conditioner has a compressor high-pressure or low-pressure switch open, investigate system pressures and correct abnormalities.

Summary

Single and Multiple Zone Outdoor Units

Outdoor Unit Clearances

Specifies the required clearances around single-zone outdoor units for proper ventilation and service access.

M22 A, M33 A and M33 B Cassette Non-Ducted Indoor Units

M22 A, M33 A and M33 B Indoor Unit Clearances

Specifies the required clearances for M22A, M33A, and M33B cassette indoor units.

MCFA and MCFB Ceiling; Floor Indoor Units

Indoor Unit Clearances

Specifies required clearances for MCFA and MCFB ceiling/floor indoor units.

Refrigeration Pipe Work

Single-Zone Piping Limitations

Details limitations for refrigerant pipe length and elevation for single-zone systems.

MPA, MPB and MLA Outdoor Unit Connections and Line Set Usage

Power Wiring for Outdoor and Indoor Units (Diagrams)

Condensate Pipe Work Installation

Indoor Unit Gravity Drain

Instructions and diagrams for correctly installing indoor unit gravity drain lines.

Indoor Unit Lift Pump

Details requirements for condensate piping when using an indoor unit lift pump.

Connection to Centralized Controller

Set Indoor Unit Address for Centralized Control

Start-Up

Adding Refrigerant - Single-Zone Systems

Instructions for adding refrigerant to single-zone systems based on pipe length.

Quick Reference Guide - Error Codes

Troubleshooting Outdoor Unit Error Codes

Troubleshooting Indoor Unit Error Codes

Temperature Sensor Resistance Values

Component Troubleshooting

Compressor Check

Explains how to check compressor windings resistance for shorts and terminal identification.

IPM Check

Details the procedure to measure resistance across IPM terminals for testing.

Component Protection

Fan Motor

Inverter Module Protection

Low Voltage Protection

Compressor Current Limit Protection

Specifications and Operations

Capacity Request Calculations

Defrost Control

Defrost Termination

Lennox MWMA012S4-*P Specifications

General IconGeneral
Cooling Capacity (BTU/hr)12, 000
EER11.5
Voltage (V)208/230
Phase1
Hertz (Hz)60
RefrigerantR-410A

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