Service manual

Troubleshooting ESIE03–01

3–14 Part 3 – Troubleshooting

P In the case of the shaded error codes, "inspection" is not displayed. The system operates, but be

sure to inspect and repair it.

Note Operation when a malfunction occurs may differ according to the model.

U4 or UF Failure of transmission (between indoor and outdoor unit) Wrong wiring between indoor and outdoor

units or malfunction of the PC board

mounted on the indoor and the outdoor

units. If UF is shown, the wiring between the

indoor and outdoor units is not properly

wired. Therefore, immediately disconnect

the power supply and correct the wiring.

(The compressor and the fan mounted on

the outdoor unit may start operation inde-

pendent of the remote controller operation.)

U5 Failure of transmission (between indoor unit and remote con-

troller)

Transmission between indoor and remote

controller is not being correctly carried out.

U8 Failure of transmission (between "main" and "sub" remote

controller

Transmission between "main" and "sub"

remote controller is not being correctly car-

ried out.

UA Failure of field setting System setting mistake for Twin system.

UC Address duplication of central remote controller

Malfunction

Code

Contents/Processing Remarks