Haier AW07LC2VHA Technical Overview page 103

1. Check whether terminals CN23 and CN24 and
terminals CN10 and CN 11 on the IPM module are
securely connected
Are they secure?
Turn on the unit. Check that the voltage between pins 1 and 2 of
terminal CN23 is about 5VDC.
Check that the voltage between pins 2 and 3 of terminal CN23 is
15VDC
Replace the outdoor main board
FLOW CHARTS FLOW CHARTS
LED1 flashes 4 times
• The outdoor PCB is defective and will lead to a communication fault
• The IPM module is defective and will lead to a communication fault
•The outdoor PCB is defective
•The IPM Module is defective
• Communication wiring connections
Caution: Be sure to turn power switch off before connecting or disconnecting the
connector, or parts may sustain damage.
YES
NO
REFERENCES
NO
Pull out and reinsert the terminals
YES
Replace the outdoor IPM module
PAGE 103