Mitsubishi Heavy Industries FDTC25VH User Manual

Manual No.'19・SCM-SM-276
SERVICE MANUAL
INVERTER MULTI-SPLIT SYSTEM
RESIDENTIAL AIR-CONDITIONERS
(Split system, air to air heat pump type)
(OUTDOOR UNIT)
SCM71ZS-W
80ZS-W
(INDOOR UNIT)
Wall mounted type
SRK20ZSX-W,-WB,-WT
Duct connected-Low/Middle static pressure type
FDUM50VH
SRK71ZR-W
25ZSX-W,-WB,-WT
35ZSX-W,-WB,-WT
50ZSX-W,-WB,-WT
60ZSX-W,-WB,-WT
SRK20ZS-W,-WB,-WT
25ZS-W,-WB,-WT
35ZS-W,-WB,-WT
50ZS-W,-WB,-WT
4-way ceiling cassette type
FDTC25VH
35VH
50VH
60VH
Ceiling concealed type
SRR25ZM-W
35ZM-W
50ZS-W
60ZS-W
Ceiling suspended type
FDE50VH

Mitsubishi Heavy Industries FDTC25VH Specifications

General

Brand	Mitsubishi Heavy Industries
Model	FDTC25VH
Category	Air Conditioner
Language	English

Summary

Inverter Multi-Split System Residential Air-Conditioners Overview

Operation Control by Microcomputer

SRK and SRR Series Operation Control

Overview of operation control functions for SRK and SRR series models.

SRK-ZSX Series Wireless Remote Control

SRK-ZR Series Operation Control

SRR Series Operation Control

Protective Control Functions Overview

FDTC, FDUM and FDE Series Operation Control

Wired Remote Control (RC-EX3A)

RC-E5 Wired Remote Control Overview

Wired Remote Control Operation Functions

Cooling/Dehumidifying Frost Protection

Temperature Sensor Anomalies and External I/O Control

Outdoor Unit Overview

Defrost Operation Conditions and Ending

Protective Control Functions

Cooling Overload and High Pressure Protection

Protective controls for cooling overload and high pressure conditions.

Cooling Low Temp and Heating High Pressure Protection

Heating Overload and Low Outdoor Temperature Protection

Refrigeration Cycle Protection and Service Valve Operation

Compressor Overheat and Current Safe Protection

Current Cut, Outdoor Unit Failure, and Sensor Protection

Maintenance Data and Troubleshooting

Troubleshooting: Air Conditioner Not Running

Step-by-step troubleshooting guide when the air conditioner fails to start.

Troubleshooting: Air Conditioner Running with Issues

Self-Diagnosis Table for Error Codes

A table listing error codes, their causes, and corresponding display patterns.

Service Mode Access and Operation

Error Code, Stop Code, and Cause Table

Inspection Procedures for Troubleshooting Details

Indoor Fan Motor Error Troubleshooting

Current Cut and Current Safe Stop Troubleshooting

Compressor Overheat and Signal Transmission Error Troubleshooting

Rotor Lock and Drain Abnormality Troubleshooting

Outdoor Fan Motor Error Troubleshooting

Indoor Electrical Equipment Checks

Indoor Unit PCB and Fan Motor Checks

Wireless Remote Control Checks

Fuse Inspection Procedures

Steps to inspect and replace blown fuses on indoor and outdoor unit PCBs.

FDTC, FDUM and FDE Series Microcomputer Diagnosis

Diagnosing Microcomputer Circuits

Using the self-diagnosis function to diagnose microcomputer circuit issues.

Indoor Unit Error Codes and Troubleshooting

Outdoor Unit Error Codes and Troubleshooting

Error Log Management and General Troubleshooting

Indoor Unit Troubleshooting Procedures

Detailed troubleshooting steps for indoor unit issues, including PCB and component checks.

Self-Diagnosis Data Explanation

Outdoor Unit Troubleshooting Overview

Checking Anomalous Operation Data via Remote Control

Troubleshooting: Operates but Does Not Cool

Troubleshooting: Operates but Does Not Heat

Troubleshooting: Earth Leakage Breaker Activated

Troubleshooting: Excessive Noise/Vibration (1/3)

Troubleshooting: Excessive Noise/Vibration (2/3)

Troubleshooting: Excessive Noise/Vibration (3/3)

Troubleshooting: Louver Motor Failure (FDTC/FDE)

Troubleshooting: Power Source System Error (Indoor PCB)

Troubleshooting: Power Source System Error (Remote Control)

Troubleshooting: INSPECT I/U (1-2 Remotes)

Troubleshooting: INSPECT I/U (3+ Remotes)

Troubleshooting: Communication Error at Initial Operation (1/3)

Troubleshooting: Communication Error at Initial Operation (2/3)

Troubleshooting: Communication Error at Initial Operation (3/3)

Troubleshooting: Indoor Heat Exchanger Sensor Anomaly

Troubleshooting: Return Air Temperature Sensor Anomaly

Troubleshooting: Heating Overload Operation

Troubleshooting: Drain Trouble (FDTC/FDUM)

Troubleshooting: Excessive Indoor Units Connected

Troubleshooting: Indoor Unit Address Setting Error

Troubleshooting: Indoor Fan Motor Anomaly

Troubleshooting: Indoor Unit Operation/Drain Pump Check Error

Troubleshooting: Indoor Fan Motor Rotation Speed Anomaly

Troubleshooting: Remote Control Temperature Sensor Anomaly

Troubleshooting: Cooling High Pressure Operation

Troubleshooting: Discharge Pipe Temperature Error

Troubleshooting: Outdoor Heat Exchanger Temperature Sensor Anomaly

Troubleshooting: Outdoor Air Temperature Sensor Anomaly

Troubleshooting: Suction Pipe Temperature Sensor Anomaly

Troubleshooting: Refrigerant Amount/Service Valve Closure Detection

Troubleshooting: Current Safe Stop

Troubleshooting: Compressor Startup Failure

Troubleshooting: Compressor Rotor Lock Error

Troubleshooting: Current Cut (1/2)

Troubleshooting: Current Cut (2/2)

Troubleshooting: Outdoor Unit Sub PCB Communication Error

Troubleshooting: Active Filter Voltage Error

Troubleshooting: Outdoor Fan Motor Anomaly

Troubleshooting: Power Transistor Anomaly

Electrical Wiring Diagrams

Outdoor Unit Electrical Wiring Diagrams

Piping System Diagrams