Troubleshooting by Error Code
1. Check also if the relay connector between the indoor unit control PCB and the fan motor are
correctly connected.
Reference
CHECK 16 Refer to page 466.
321
A
The HAP
lamp on the indoor unit
control PCB is
blinking.
YES
NO
SiUS372201EB
Replace the indoor unit control
PCB (A1P).
Replace the fan motor (M1F).
Part 6 Service Diagnosis