Why McQuay M5LCY shows high side low side?
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).
General| Brand | McQuay |
|---|---|
| Model | M5LCY |
| Category | Air Conditioner |
| Language | English |
Lists various McQuay product models and their descriptions.
Provides conversion factors for units like capacity, pressure, flow rate, temperature, and volume.
Compares mainboards and compatible handset models for different HVAC unit types.
Explains the operation of the G6 remote control for HVAC units.
Details the operation and features of the G7 remote control for HVAC systems.
Describes the functions and operation of the G11 remote control for HVAC units.
Explains the operation and settings of the G17 remote control for HVAC units.
Outlines the operation and features of the GS01 remote control for HVAC units.
Details the operation of the APJ1 remote control, including LCD display functions.
Explains the operation of the SLM3 controller, including modes and settings.
Covers the operation and settings of the SLM8 controller for HVAC systems.
Describes the operation and differences between Netware 3 and Netware 3C controls.
Explains the operation and alarm indications of the Rooftop Panel.
Details the operation and LCD display of the Chiller Panel.
Explains the operation of the MC301 controller, including settings and clock.
Covers the operation of the MC303 controller, including address registration and settings.
Explains how to configure the auto random restart function for controllers.
Details the hot keep selection options for various HVAC models.
Covers dip switch settings for the Sequential Board SQ2.0.
Explains jumper settings for W1V3 units for different modes and applications.
Details jumper configurations for W2.0 units to set operating modes.
Describes hardware settings and jumper configurations for the SLM8.
Explains how to convert U1.5 heatpump PCB to auxiliary heater application.
Details adding a heater relay to the SB125 heatpump PCB for auxiliary heater function.
Explains adding components for W2 heatpump auxiliary heater conversion.
Covers conversion to multi-split units for Cooling Only and Heatpump models.
Details the process and parts required for converting U1.5 to L208A PCB.
Explains the conversion from WMF U1.4 to L2EF PCB, noting compatibility issues.
Details the conversion steps for SQ Board for long-distance wiring.
Outlines the steps for converting Sequential LCD for long-distance wiring.
Explains how to use the temperature sensor TH1 as a room sensor on Netware 3.
Provides a table for diagnosing faults based on LED lights for Wall Mounted F Series.
Diagnoses faults using LED lights for Wall Mounted F Series Heat Pump models.
Diagnoses faults using LED lights for Wall Mounted G Series.
Provides LED light diagnosis for Wall Mounted J Series models.
Diagnoses faults using LED lights for Ceiling Cassette A/B/C Series.
Provides LED light diagnosis for Ceiling Cassette A/B/C/E Series models.
Diagnoses faults using LED lights for Ceiling Exposed D Series models.
Provides LED light diagnosis for Ceiling Exposed D/E Series models.
Lists self-diagnostic tables for W1V3 and W2 models of Chilled Water Fan Coil Units.
Diagnoses faults using LED lights for Water Source Split Unit - Wall Mounted G Series.
Provides LED light diagnosis for Water Source Split Unit - Ceiling Cassette A/B/C Series.
Diagnoses faults using LED lights for Wall Mounted F Cooling Only Inverter-X.
Provides LED light diagnosis for Wall Mounted F Heatpump Inverter-X models.
Diagnoses faults using LED lights for Wall Mounted G Series Inverter-X models.
Provides LED light diagnosis for Ceiling Cassette A/C Series Inverter-X models.
Diagnoses faults using LED lights for Ceiling Convertible E Series Inverter-X models.
Explains RED LED blinking indications for normal running and compressor status.
Lists error codes and faulty indications for compressor stopped errors.
Lists operations and faulty indications for Inverter-Y Indoor Series.
Details unit running parameters and lists error codes indicated by HAP/H3P LEDs.
Explains system running conditions based on LED indications.
Lists error codes and faulty indications for SLM 3/Netware 3/SLM 9 On/Off Models.
Lists error codes and faulty indications for SLM 3/Netware 3 Fan Coil Units.
Lists error codes and faulty indications for SLM 3 Inverter X Models.
Lists error codes and their faulty indications for Netware 3C/SLM 9 Inverter Y Models.
Lists error codes and their faulty indications for Sequential Controller.
Describes alarm display and lists error messages, causes, and actions for Rooftop Panel.
Lists error codes, descriptions, and troubleshooting measures for Chiller Panel.
Provides steps to diagnose errors using the G17 Inverter Y Model handset.
Explains how to diagnose errors using the unit's last state memory.
Outlines the procedure for diagnosing errors using the GS01 Inverter Y Model handset.
Describes error diagnosis using the unit's last state memory.
Lists error codes and their descriptions for Inverter Y Models.
Provides steps for diagnosing errors using the APJ1 handset.
Lists system, indoor, and outdoor unit error codes for APJ1.
Details MDS diagnosis for indoor units via LED indicator and wired controller.
Lists error codes and descriptions for MC301 wired controller.
Continues the list of error codes and descriptions for MC301 wired controller.
Explains error code diagnosis for MDS Outdoor Units using 7-segment display.
Lists common problem symptoms and suggested actions for troubleshooting.
Guides troubleshooting based on high/low side pressure readings.
Provides resistance values for temperature sensors across a range of temperatures.
Continues the resistance-temperature data for sensors.
Shows compatibility between Indoor PCBs, MC301 handset, and Outdoor PCBs.
Provides dip switch settings for MDS Outdoor Unit capacity.
Lists standard, optional, and maximum cable lengths for wired handsets.
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