Carrier 24AHA4 - Page 18

18
2 --- Zero crossing signal detection error --- diagnosis and solution (E2)
Error Code E2
Malfunction conditions
When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing
signal time interval is abnormal.
Possible Causes
• Connection mistake
• Defective PCB
Trouble shooting:
Check if the connections and
power supply is normal?
Correct the connections. Turn on the
unit when the power supply is good.
No
Yes
Indoor main PCB is
defective. Replace indoor
main PCB.
A14482