Components ......................................................................................................................................................................... H-2

Component Overview .........................................................................................................................................................H-2

Indoor Circuit Board.............................................................................................................................................................H-3

Testing .................................................................................................................................................................................. H-4

Removing the Filter Cover & Filter ......................................................................................................................................H-4

Front Cover Removal ...........................................................................................................................................................H-4

Control Box Removal ...........................................................................................................................................................H-4

Board Replacement .............................................................................................................................................................H-4

Upper Louver Removal ........................................................................................................................................................H-5

Lower Damper Assembly Removal .....................................................................................................................................H-5

Replace Fan Motor ...............................................................................................................................................................H-5

Indoor Fan Motor Test Procedure .......................................................................................................................................H-6

Testing Temperature Sensors .............................................................................................................................................H-7

Testing Louver Motors ........................................................................................................................................................H-7

Testing Communication Circuit ..........................................................................................................................................H-8

Replacing WiFi Module .........................................................................................................................................................H-8

Wiring Diagram/DIP Switch Settings .................................................................................................................................... H-9

Error Codes ......................................................................................................................................................................... H-10

CONSOLE TECHNICAL OVERVIEW

Table of Contents

CONSOLE TECHNICAL OVERVIEW

USYF09UCDWA

USYF12UCDWA

USYF18UCDWA

H-1

Table of Contents