Troubleshooting by Indication on the Remote Controller ESIE09-08A
210 Troubleshooting
3.56 “U4 ” Malfunction of Transmission between Indoor Unit and
Outdoor Unit
Remote Control
Display
U4
U4 subcode 0
Applicable Models AII indoor unit models
ER*Q 011~016*
Method of
Malfunction
Detection
Microcomputer checks if transmission between indoor and outdoor unit is normal.
Malfunction
Decision Conditions
When transmission is not carried out normally for a certain amount of time
Supposed Causes Indoor to outdoor transmission wiring F1, F2 disconnection, short circuit or wrong wiring
Outdoor unit power supply is OFF
Defect of outdoor unit PC board
Defect of indoor unit PC board (A1P)
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