Troubleshooting steps
Check communication wiring, verify connections, reset system
HVAC Error Codes
Carrier E40 Error
Communication error
Details
Carrier E40 error indicates communication error. Faulty wiring, loose connections, board issue. Check communication wiring, verify connections, reset system.
Error typeerror
MeaningCommunication error
Typical causesFaulty wiring, loose connections, board issue
SolutionsCheck communication wiring, verify connections, reset system
Severityhigh
Catalog references
Where this appears
CarrierE40
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Common questions
What causes E40 error?
Faulty wiring, loose connections, board issue
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