Haier HSU-18HEA03/R2(DB)-I User Manual

64
Domestic air conditioner
HSU-18HEA03/R2(DB)-I
Service Diagnosis
7.3.5 The communication fault between IPM and outdoor PCB

outdoor display LED1 flash 4 times
Method of
Communication is detected by checking the IPM module and the outdoor PCB
Malfunction
Detection
Malfunction
Ƶ The outdoor PCB broken leads to communication fault
Decision
Ƶ The IPM module broken leads to communication fault
Conditions
Supposed
Ƶ The outdoor PCB is broken
Causes
Ƶ The IPM module is broken
Ƶ Communication wiring disconnected
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
NO
NO
YES
Are they good?
1) Pull out and reinsert the terminals.
2) Replace connected wire
1) Check whether Terminal CN23 and CN24 on the
outdoor mainboard CN10 and CN11 on IPM module
2) Check whether the connected wire between IPM and
outdoor
YES
Replace the outdoor IPM
module with a new one.
Replace the outdoor mainboard with a new
one
Electrify the machine again and
turn it on, Check whether the
voltage between 1 and 2 o
f
Terminal CN23 is about DC5V,
Check whether the voltage
between2 and 3 of Terminal
CN23 is about DC15V,

Haier HSU-18HEA03/R2(DB)-I Specifications

General

Brand	Haier
Model	HSU-18HEA03/R2(DB)-I
Category	Air Conditioner
Language	English