Service manual

Error Codes: System Malfunctions ESIE03–01
3–68 Part 3 – Troubleshooting
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4.6 Transmission Error between MAIN Remote Controller
and SUB Remote Controller (U8)
Error code U8
Error generation The error is generated when, in case of controlling with two remote controllers, the microprocessor
detects that the transmission between the indoor unit and the remote controllers (MAIN and SUB) is
not normal over a certain amount of time.
Causes The possible causes are:
P Transmission error between MAIN remote controller and SUB remote controller
P Connection among SUB remote controllers
P Malfunctioning remote controller PCB.
Troubleshooting To troubleshoot, proceed as follows:
Caution Be sure to turn off power switch before connecting or disconnecting the connector, or parts damage
may occur.
Turn the SS-1 switch of one
remote controller to MAIN.
Turn OFF the power supply,
and restart operation.
Turn OFF the power once and
restart operation.
Replace remote controller PCB
if any error is generated.
Turn the SS-1switch of one
remote controller to MAIN.
Turn OFF the power supply,
and restart operation.
Controlling
with 2-remote
controller
Both SS-1
switches on remote
controllers are turned
to SUB
SS-1 switch
on remote controller
PCB is turned
to MAIN
NO
NO
NO
YES
YES
YES