Communication Malfunction Between The Indoor And Outdoor Units (E2/E1) - Carrier 38MGR Series Service Manual

DIAGNOSIS AND SOLUTION (CONT)

Communication malfunction between the indoor and outdoor units (E2/E1)

ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Is it still displaying the error code?
Turn off all the indoor units.
Is the IPM power LED or operating
38MGR-04SM
E2/E1
Indoor unit does not receive feedback from the outdoor unit during 120 seconds or the outdoor unit
does not receive feedback from any indoor unit during 180 seconds.
• Indoor or outdoor PCB faulty
• Wiring mistake
units
Yes
No
Yes
No
Yes
Yes
No
LED lamp on?
Yes
No
well connected?
Yes
Specifications subject to change without notice.
No
Yes
Is the reactor
No
Yes
A
No
No
A
Yes
No
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