Si71-502 Troubleshooting
Troubleshooting 41
1.6 Damper System Error (Alarm)
Remote Controller
LCD Display
Error Code
6A
Inspection
OFF
Unit No. Blinking
LED Indication Remote Controller
4
Main Unit
5
Error Detection
Method
Measurement of damper motor limit ON/OFF time.
Error Generating
Conditions
When damper motor limit switch 1 (or 2) remains ON (or OFF) for more than a certain time duration
after ventilation mode is changed.
When damper motor limit switch 1 (or 2) repeats ON/OFF operations after damper motor 1 (or 2) stops.
Possible Causes
Faulty damper motor or limit switch
Broken wire in cable
Faulty contact in connector (including relay connector)
Faulty control PCB assembly
Troubleshooting
Note: Note 1:
Place tester probes on connectors of limit switch. Move switch by hand and check continuity. If tester
indicates 0Ω when limit switch turns on, and infinity when it turns off, limit switch is normal.
Place tester probes on connectors of damper motor and check resistance. If tester indicates approx. 17
kΩ in 200-V model, damper motor is normal.
Check connectors
(X3A or X4A) (X5A or
X6A) on PCB assembly
of damper motor unit.
Is
damper
motor unit
operating
normally?
Note 1
YES
YES
YES
Connect relay connector.
Connect connectors.
Replace damper motor unit.
Replace control PCB assembly.
Is
relay
connector of
damper motor unit
connected?
NO
(HF005)
NO
Are connectors
connected?
NO
Check resistance and voltage
(HL029)
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