Mitsubishi Electric ERST20F-YM9E User Manual

SERVICE MANUAL
Note:
This manual describes
service data of cylinder
unit only.
PARTS CATALOG (OCB814)
CYLINDER UNIT
CYLINDER UNIT
MAIN REMOTE
CONTROLLER
August 2023
No. OCH814
REVISED EDITION-A
[Service Ref.]
CONTENTS
1. REFERENCE MANUAL ···························· 2
2. SAFETY PRECAUTION ··························· 3
3. SPECIFICATIONS ···································· 5
4. PART NAMES AND FUNCTIONS ·········· 10
5. OUTLINES AND DIMENSIONS ·············· 13
6. WIRING DIAGRAM ································· 15
7. FIELD WIRING ········································ 26
8. WATER SYSTEM DIAGRAM ·················· 30
9. CONTROLS ············································ 35
10. TROUBLESHOOTING ···························· 58
11. DISASSEMBLY PROCEDURE ··············· 77
12. SUPPLEMENTARY INFORMATION ····· 100
13. SERVICE AND MAINTENANCE ·········· 101
[Model Name]
Revision:
•
Added model names
and service ref. in
REVISED EDITION-A.
OCH814 is void.
EHPT17X-VM2E
EHPT17X-VM6E
EHPT17X-YM9E
EHPT20X-MEHEW
EHPT20X-TM9E
EHPT20X-YM9E
EHPT30X-YM9EE
EHST17D-VM2E
EHST17D-YM9E
EHST20D-VM2E
EHST20D-VM6E
EHST20D-YM9E
EHST20D-TM9E
EHST30D-MEE
EHST30D-VM6EE
EHST30D-YM9EE
EHST30D-TM9EE
ERPT17X-VM2E
ERPT20X-VM2E
ERPT20X-VM6E
ERPT20X-YM9E
ERPT30X-VM2EE
ERPT30X-VM6EE
ERPT30X-YM9EE
ERST17D-VM2E
ERST17D-VM6E
ERST17D-VM2BE
ERST17D-VM6BE
ERST17D-YM9BE
ERST20D-VM2E
ERST20D-VM6E
ERST20D-YM9E
ERST30D-VM2EE
ERST30D-VM6EE
ERST30D-YM9EE
ERST20C-VM2E
ERST30C-VM2EE
ERST20F-VM2E
ERST20F-VM6E
ERST20F-YM9E
ERST20F-TM9E
ERST30F-VM2EE
ERST30F-VM6EE
ERST30F-YM9EE
ERST30F-TM9EE
EHPT17X-VM2E.UK
EHPT17X-VM6E.UK
EHPT17X-YM9E.UK
EHPT20X-MEHEW.UK
EHPT20X-TM9E.UK
EHPT20X-YM9E.UK
EHPT30X-YM9EE.UK
EHST17D-VM2E.UK
EHST17D-YM9E.UK
EHST20D-VM2E.UK
EHST20D-VM6E.UK
EHST20D-YM9E.UK
EHST20D-TM9E.UK
EHST30D-MEE.UK
EHST30D-VM6EE.UK
EHST30D-YM9EE.UK
EHST30D-TM9EE.UK
ERPT17X-VM2E.UK
ERPT20X-VM2E.UK
ERPT20X-VM6E.UK
ERPT20X-YM9E.UK
ERPT30X-VM2EE.UK
ERPT30X-VM6EE.UK
ERPT30X-YM9EE.UK
ERST17D-VM2E.UK
ERST17D-VM6E.UK
ERST17D-VM2BE.UK
ERST17D-VM6BE.UK
ERST17D-YM9BE.UK
ERST20D-VM2E.UK
ERST20D-VM6E.UK
ERST20D-YM9E.UK
ERST30D-VM2EE.UK
ERST30D-VM6EE.UK
ERST30D-YM9EE.UK
ERST20C-VM2E.UK
ERST30C-VM2EE.UK
ERST20F-VM2E.UK
ERST20F-VM6E.UK
ERST20F-YM9E.UK
ERST20F-TM9E.UK
ERST30F-VM2EE.UK
ERST30F-VM6EE.UK
ERST30F-YM9EE.UK
ERST30F-TM9EE.UK

Mitsubishi Electric ERST20F-YM9E Specifications

General

Power Supply	220-240V, 50Hz
Outdoor Unit Noise Level	52 dB(A)
Outdoor Unit Dimensions (HxWxD)	550 x 800 x 285 mm
Type	Split
Product Type	Heat Pump

Summary

Safety Precautions

General Safety Guidelines and Symbols

Explains warning symbols and outlines general safety precautions for mechanical, electrical, and general handling.

Specific Cautions for Service Personnel

Specifications

Wiring Diagram

Model-Specific Wiring Diagrams

Provides detailed wiring diagrams for different unit model series for installation and troubleshooting.

DIP Switch Functions and Settings

Field Wiring

Electrical Connection Procedures

Water System Diagram

Controls

Main Remote Controller Interface

Explains the main remote controller screen, icons, and basic operation.

Quick Start and System Configuration

Guides through initial setup, system configuration, and lock menu settings.

Service Menu and Advanced Settings

Details service menu functions for installers, including manual operations and component settings.

Operational Mode Settings

DHW and Legionella Prevention Settings

Troubleshooting

Troubleshooting Overview and Test Run

Provides a general approach to troubleshooting, check codes, and test run procedures.

Self-Diagnosis and Error Code Resolution

Details self-diagnosis features, error codes, their causes, and corrective actions.

Troubleshooting by Inferior Phenomena

Addresses common operational issues not indicated by error codes, providing diagnostic steps.

Component Part Functional Checks

Disassembly Procedure

Preparation and Front Panel Removal

Covers preparation for repair service and steps to remove the front panel and remocon assembly.

Electrical Component Disassembly

Internal Component Removal Procedures

Thermostat, Heater, and Sensor Removal

Service and Maintenance

Commissioning and Field Settings Record

Annual Maintenance Procedures

Outlines scheduled annual maintenance tasks, parts replacement, and inspection guidelines.