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McQuay MWM - User Manual

McQuay MWM
84 pages
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SERVICE
GUIDE BOOK

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Questions and Answers

  • C
    Carolyn GarrettJul 31, 2025
    What to do if my McQuay MWM Air Conditioner is not cooling enough?
    • T
      Tristan SalasAug 1, 2025
      If your McQuay Air Conditioner isn't cooling sufficiently, it might be due to a dirty indoor or outdoor coil. Try cleaning the coil. Also check for any obstructions at the air inlet or outlet of the indoor or outdoor unit and remove them. It could also be caused by a refrigerant short charge or leakage, in which case you should add refrigerant and repair the leakage.
  • C
    calderonreginaAug 10, 2025
    How to fix a McQuay MWM that won't turn on (no cooling/heating)?
    • R
      Regina PearsonAug 10, 2025
      If your McQuay Air Conditioner fails to start, it could be due to a faulty contactor, contacts or motor. Try changing the contactor or the contacts. You might also need to repair or change the motor.
  • J
    jamesrayAug 21, 2025
    Why McQuay Air Conditioner shows high side low side?
    • W
      William WilliamsAug 22, 2025
      If your McQuay Air Conditioner is showing a high side low side issue, it could be due to: * An undercharge of refrigerant. * Refrigerant leakage. * A clogged or dirty air filter in the indoor unit. * A locked indoor fan (during cooling). * A defective defrost control causing outdoor coil freeze-up (during heating). * A locked outdoor fan (during heating).

Summary

CONVERSION TABLE

HANDSET OPERATING GUIDE

CONTROLLER SETTING

CONVERSION CONFIGURATION

Sequential LCD Conversion for 1000 m Wiring

SERVICE DIAGNOSIS

LED Diagnosis: Wall Mounted F Series Cooling Only

Interpreting LEDs for cooling-only F series units.

LED Diagnosis: Wall Mounted F Series Heat Pump

Interpreting LEDs for heat pump F series units.

LED Diagnosis: Wall Mounted G Series

Interpreting LEDs for wall-mounted G series units.

LED Diagnosis: Wall Mounted J Series

Interpreting LEDs for wall-mounted J series units.

LED Diagnosis: Ceiling Cassette A;B;C Series

Interpreting LEDs for ceiling cassette A/B/C series units.

LED Diagnosis: Ceiling Cassette A;B;C;E Series

Interpreting LEDs for ceiling cassette A/B/C/E series units.

LED Diagnosis: Ceiling Exposed D Series

Interpreting LEDs for ceiling exposed D series units.

LED Diagnosis: Ceiling Exposed D;E Series

Interpreting LEDs for ceiling exposed D/E series units.

Chilled Water Fan Coil Unit Diagnosis

Self-diagnostic tables for chilled water fan coil units.

Water Source Split Diagnosis: Wall Mounted G Series

Diagnosis for water source split wall-mounted G series.

Water Source Split Diagnosis: Ceiling Cassette A;B;C Series

Diagnosis for water source split ceiling cassette units.

Diagnosis: Wall Mounted F Cooling Only Inverter-X

Fault indication and actions for cooling-only inverter-X models.

Diagnosis: Wall Mounted F Heatpump Inverter-X

Fault indication and actions for heatpump inverter-X models.

Diagnosis: Wall Mounted G Series Inverter-X

Fault indication and actions for wall-mounted G series inverter-X models.

Diagnosis: Ceiling Cassette A;C Series Inverter-X

Fault indication and actions for ceiling cassette A/C series inverter-X models.

Diagnosis: Ceiling Convertible E Series Inverter-X

Fault indication and actions for ceiling convertible E series inverter-X models.

Inverter-X Outdoor Unit Diagnosis

Red LED blinking indications for outdoor units.

Single Split Inverter-Y Outdoor Unit Diagnosis

7-segment display diagnosis for outdoor units.

MDS Diagnosis

General Check for Malfunctions

General Troubleshooting by Pressure Readings

McQuay MWM Specifications

General IconGeneral
BrandMcQuay
ModelMWM
CategoryAir Conditioner
LanguageEnglish

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