Troubleshooting by Remote Controller Si33-105
156 Troubleshooting R407C PLUS Series Heat Recovery System
In case of the malfunction with the shaded error code, the unit still operates. However, be sure
to have it inspected and repaired and as soon as possible.
Note: Refer service manual Si71-001 for more detail of heat reclaim ventilation troubleshooting.
Malfunction
code
Operation
lamp
Inspection
display
Unit No. Malfunction contents
Page
Refered
Centralized
Control
and
Schedule
Timer
UE 999Malfunction of transmission between central
remote controller and indoor unit
204
209
M1 8 or 99 9PC board defect 205
210
M8 8 or 99 9Malfunction of transmission between optional
controllers for centralized control
206
211
MA 8 or 99 9Improper combination of optional controllers for
centralized control
207
212
MC 8 or 99 9Address duplication, improper setting 208
213
Heat
Reclaim
Ventilation
60 879Overall alarm —
999Overall malfunction —
64 879Inside air thermistor error —
65 879Outside air thermistor error —
6A 879Damper system alarm —
6A 999Damper system + thermistor error —
U5 999Data transmission error between LCD remote
controller and main unit
—
U5 797LCD remote controller connection error —
U8 797Data transmission error between master-slave
LCD remote controllers
—
UA 797LCD remote controller connection error (no remote
controller for air conditioner in air conditioner
group)
—
UC 888Overlapping central control address —
UE 999Transmission error between the unit and
centralized controller
—
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