Unspecified Voltage (Between Indoor Unit And Outdoor Unit), Anti-Icing Control In Other Rooms - Daikin 4MXL-T Series Service Manual

SiUS121827E
7.4 Unspecified Voltage (Between Indoor Unit and Outdoor
Unit), Anti-icing Control in Other Rooms
UA, UH
Error Code
Outdoor Unit LED A j 1 h 2 h 3 h 4 h 5 h
Display
Method of Error A wrong connection is detected by checking the combination of indoor and outdoor units on the
Detection microcomputer.
Error Decision  Anti-icing control in other rooms
Conditions  Unspecified internal and/or external voltages
 Mismatching of indoor and outdoor units
Supposed
 Anti-icing function in other rooms
 Power supply voltage out of specification
Causes
 Wrong models interconnected
 Wrong indoor unit PCB or outdoor unit PCB mounted
Troubleshooting
Note
Refer to Anti-icing control for indoor unit on page 202 for details.
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Error displayed
while operating?
YES
Power supply
voltage as specified?
YES
Check the model combination.
Matched
compatibly?
YES
NO
NO
NO
Troubleshooting for Outdoor Unit
The anti-icing function is
activated in other rooms.
Refer to A5.
Correct the power supply
voltage.
Match the compatible models.
Check the combination of all
connected models.
(R21922)
201