Mitsubishi Electric SLZ-KF12NA.TH User Manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. REFERENCE MANUAL
......................
2
2. SAFETY PRECAUTION ......................2
3. PARTS NAMES AND FUNCTIONS
.....
4
4. SPECIFICATIONS
...............................
9
5. OUTLINES AND DIMENSIONS
.........
11
6. WIRING DIAGRAM
............................
13
7.
REFRIGERANT SYSTEM DIAGRAM
.....
14
8. TROUBLESHOOTING
.......................
15
9. SPECIAL FUNCTION
........................
28
10. 4-WAY AIRFLOW SYSTEM
...............
30
11. DISASSEMBLY PROCEDURE
..........
32
Indoor unit
[Model Name] [Service Ref.]
SLZ-KF09NA.TH
SLZ-KF12NA.TH
SLZ-KF15NA.TH
SLZ-KF18NA.TH
INDOOR UNIT
Model name
indication
SLZ-KF09NA
SLZ-KF12NA
SLZ-KF15NA
SLZ-KF18NA
WIRED REMOTE CONTROLLER
(Option)
PARTS CATALOG (OCB669)
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
WIRELESS REMOTE
CONTROLLER
(Option)
No. OCH669
REVISED EDITION-A
February 2019
OCH669 is void.
Revision:
• Some descriptions have
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EDITION-A.

Mitsubishi Electric SLZ-KF12NA.TH Specifications

General

Brand	Mitsubishi Electric
Model	SLZ-KF12NA.TH
Category	Air Conditioner
Language	English

Summary

Safety Precautions for R410A Systems

General Safety Observations

General safety guidelines to follow before accessing terminals and supply circuits.

Cautions Related to New Refrigerant R410A

Cautions for units utilizing refrigerant R410A, covering pipes, cleaning, oil, and charging.

Service and Tool Cautions

Cautions for Service Operations

Precautions for performing service, including refrigerant recovery and charging procedures.

Additional Refrigerant Charging Guidelines

Guidelines for charging refrigerant directly from a cylinder, emphasizing syphon type.

Essential Service Tools for R410A

Wiring Diagram and Notes

Refrigerant System Diagram

Troubleshooting: General Procedures

Troubleshooting Summary by Check Code

Summary of check codes and actions for reoccurring/non-reoccurring troubles.

Malfunction Diagnosis via Remote Controller

Procedure for performing self-diagnosis using the remote controller.

Self-Diagnosis Action Table

P1: Room Temperature Thermistor (TH1) Issues

Details diagnosis and countermeasures for room temperature thermistor issues.

P2: Pipe Temperature Thermistor (TH2) Issues

Details diagnosis and countermeasures for pipe temperature thermistor issues.

P4: Drain Float Switch Contact Failure

Details diagnosis and countermeasures for drain float switch contact failures.

P5: Drain Overflow Protection Operation

Details diagnosis and countermeasures for drain overflow protection.

P5: Drain Pump Lock Protection

P6: Freezing/Overheating Protection

Details diagnosis and countermeasures for freezing/overheating protection.

P8: Pipe Temperature Anomalies

Details diagnosis and countermeasures for pipe temperature anomalies.

P9: Condenser/Evaporator Thermistor (TH5) Issues

Details diagnosis and countermeasures for condenser/evaporator thermistor issues.

PL: Abnormal Refrigerant Circuit

Details diagnosis and countermeasures for abnormal refrigerant circuits.

E0/E4: Remote Controller Transmission Error

Details diagnosis and countermeasures for remote controller communication errors.

E3/E5: Remote Controller Transmission Errors

Details diagnosis and countermeasures for remote controller transmission errors.

E6: Indoor/Outdoor Comm. Error (Signal)

Details diagnosis and countermeasures for indoor/outdoor unit communication errors.

E7: Indoor/Outdoor Comm. Error (Transmit)

Details diagnosis and countermeasures for indoor/outdoor unit transmitting errors.

FB(Fb): Indoor Controller Board Issues

PA: Forced Compressor Stop (Water Leakage)

Details diagnosis and countermeasures for forced compressor stop due to water leakage.

PB(Pb): Fan Motor Trouble

Details diagnosis and countermeasures for fan motor issues.

Troubleshooting Specific Problems

LED2 Off on Indoor Controller Board

Troubleshooting steps when LED2 on the indoor controller board is off.

LED2 Blinking on Indoor Controller Board

Troubleshooting steps when LED2 on the indoor controller board is blinking.

Test Point Diagram for Indoor Board

Indoor Controller Board Test Points

DIP Switch Functions and Settings

Main Parts Troubleshooting

Room Temperature Thermistor (TH1) Check

Pipe Temperature Thermistor (TH2) Check

Condenser/Evaporator Thermistor (TH5) Check

Vane Motor (MV) Check

Drain Pump (DP) Check

Drain Float Switch (FS) Check

i-see Sensor Connection Check

i-see Sensor Motor Check

DC Fan Motor and Controller Board Check

Disassembly Procedures

Removing Electrical Parts

Removing Room Temperature Thermistor (TH1)

Removing the Drain Pan

Removing Pipe Temperature Thermistors

Removing Fan Motor and Turbo Fan

Removing Drain Pump and Float Switch

Removing the Heat Exchanger