Carrier 38MBRQ36A-3 - Indoor; Outdoor Units Communication Error - Diagnosis and Solution (E1)

38MBR: Service Manual
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Indoor / Outdoor Unit's Communication Error - Diagnosis and Solution (E1)
Troubleshooting
Error Code E1
Malfunction decision conditions
Indoor unit does not receive feedback from outdoor unit for 60 seconds, or the outdoor unit does not receive
feedback from indoor unit for 120 seconds.
Supposed Causes
• Wiring mistake
• Faulty indoor or outdoor PCB
E1 displayed
Is there any interference such as
too many lamps or powertransformers?
Or is the signal wire too long?
Yes
ŽŵŵƵŶŝĐĂƟŽŶŵĂůĨƵŶĐƟŽŶďĞƚǁĞĞŶƚŚĞ
indoor and outdoor units
Power OFF.
Wait 2 minutes then restart the unit.
ŽĞƐƚŚĞƉƌŽďůĞŵƐƟůůĞdžŝƐƚ
/ƐƚŚĞƐŝŐŶĂůǁŝƌĞĂƐŚŝĞůĚĐĂďůĞ
ĂŶĚŝƐƚŚĞƐŚŝĞůĚĐĂďůĞĂĞĂƌƚŚŝŶŐ
No
Yes
/ƐƚŚĞƐŝŐŶĂůǁŝƌĞďƌŽŬĞ
No
Are the signal wires
properly inserted on the PCB?
Replace the indoor main PCB.
Is the error resolved?
Yes
No
Replace the outdoor main PCB.
Remove the interference or add
a magnet ring on the power wire.
Yes
ĚŽƉƚĂƐŚŝĞůĚĐĂďůĞƐŚŝĞůĚĐĂďůĞĞĂƌƚŚŝŶŐ
No
Replace the signal wire.
Yes
Pull out and re-insert.
No