Bryant 619AHB Series Service Manual page 20

SG-619AHB-01: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Zero crossing detection error diagnosis and solution (E2)
Malfunction Decision Conditions
When the PCB does not receive a zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal.
Possible Causes:
• Connection error
• PCB faulty
Troubleshooting
Check if the connections and
the power supply are normal.
Indoor main PCB is
defective. Replace the
indoor main PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Yes
Correct the connections. Turn on the
No
unit when the power supply is good.
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