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Lennox MWMB012S4-*L - User Manual

Lennox MWMB012S4-*L
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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 MWMB012S4-*L

Preview: Installation Instructions
Installation Instructions28 pages

Questions and Answers

  • B
    Betty JonesAug 20, 2025
    What to do if my Lennox MWMB012S4-*L Air Conditioner shows an outdoor EEPROM malfunction?
    • S
      Sarah WilliamsAug 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.
  • J
    Jennifer HaynesAug 22, 2025
    What to do if my Lennox Air Conditioner has low refrigerant?
    • B
      buchanandeborahAug 22, 2025
      If your Lennox Air Conditioner has low refrigerant, add refrigerant according to system specifications.
  • A
    Ana MartinezAug 25, 2025
    What to do if my Lennox Air Conditioner has high or low voltage protection error?
    • S
      Stephanie BowmanAug 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
    Deborah ChavezAug 26, 2025
    How to fix communication error between indoor and outdoor unit in Lennox Air Conditioner?
    • R
      Richard JonesAug 26, 2025
      To address a communication error between the indoor and outdoor units of your Lennox Air Conditioner, check the communication wiring and connections.
  • E
    Erik RiveraAug 28, 2025
    What to do if my Lennox MWMB012S4-*L Air Conditioner has a high water level alarm?
    • L
      Logan MartinezAug 28, 2025
      If your Lennox Air Conditioner is showing a high water level alarm, clear any blockage from the drain system.
  • M
    meyeralexanderAug 30, 2025
    How to reset outdoor current overload on Lennox MWMB012S4-*L Air Conditioner?
    • S
      Steve Perez Jr.Aug 30, 2025
      If your Lennox Air Conditioner senses an outdoor current overload, reset the overload protection if it has tripped.
  • E
    Edward VargasAug 31, 2025
    How to troubleshoot indoor fan speed error on Lennox Air Conditioner?
    • J
      Jennifer MendozaAug 31, 2025
      To troubleshoot an indoor fan speed error on your Lennox Air Conditioner, inspect the fan and motor for proper operation.
  • S
    stephaniethomasSep 2, 2025
    What to do if my Lennox Air Conditioner shows an outdoor unit fan speed error?
    • A
      Alyssa CamposSep 2, 2025
      If your Lennox Air Conditioner displays an outdoor unit fan speed error, check the fan for operational issues.
  • M
    melissa34Sep 4, 2025
    How to fix compressor drive error in Lennox MWMB012S4-*L Air Conditioner?
    • B
      Brandon AdamsSep 4, 2025
      To fix a compressor drive error in your Lennox Air Conditioner, inspect the compressor and associated drive components.
  • B
    Beth MccoySep 6, 2025
    What to do for compressor pressure switch issues in Lennox Air Conditioner?
    • K
      Kelly CastilloSep 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 Specifications

Details on performance, operating range, and physical characteristics of outdoor units.

Cassette Non-Ducted Indoor Units

Ducted Indoor Units

Wall Mounted Indoor Units

Ceiling; Floor Indoor Units

Indoor Unit Specifications

Performance data, operating range, and connections for MCFA/MCFB units.

Indoor; Outdoor Unit Combinations

MPA Multi-Zone System Combinations

MPB Multi-Zone System Combinations

MLA Multi-Zone System Combinations

Refrigeration Pipe Work

Refrigerant Cycle Diagrams

Diagrams illustrating refrigerant flow for single and multi-zone systems.

Power Wiring and Diagrams

Power Wiring Overview

Outdoor Unit Wiring Diagrams

Wiring diagrams for various MPA, MPB, and MLA single-zone outdoor units.

Indoor Unit Wiring Diagrams

Wiring diagrams for M22A, M33A/B, MMDA, MCFA/MCFB indoor units.

Controls and Operation

Wireless Remote Control

Wired Remote Control

Start-Up Procedures

Steps for adding refrigerant and performing initial checks.

Troubleshooting and Error Codes

Outdoor Unit Error Codes

Troubleshooting guide for outdoor unit error codes (E0, E2, E3, etc.).

Indoor Unit Error Codes

Troubleshooting guide for indoor unit error codes (CP, E0, E1, etc.).

Error Code Quick Reference

Summarized error codes for single and multi-zone units.

Component Troubleshooting

Compressor Check

IPM Check

Fan Motor Check

Specifications and Operations

Capacity Request Calculations

Lennox MWMB012S4-*L Specifications

General IconGeneral
RefrigerantR-410A
Phase1
Frequency60 Hz
Cooling Capacity12000 BTU/h
StagesSingle
Sound Pressure Level (Outdoor Unit)72 dB

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