Data Transmission Error (Between Lcd Remote Controller And Main Unit); Sie71 - Daikin VAM 150FAVE Service Manual

Troubleshooting
1.9

Data Transmission Error (Between LCD Remote Controller and Main Unit)

Remote Controller
Error Code
LCD Display
LED Indication
Remote Controller
Error Detection
Microcomputer checks if data is transmitted properly between main unit and remote controller.
Method
Error Generating
When data transmission is not performed correctly for a certain time period.
Conditions
Possible Causes
Troubleshooting
Note: Note 1:
1. Use tester to check continuity of remote controller cable.
2. Use tester to check voltage at terminal board.
42
U5
5
Inspection
5
Main Unit
Faulty connection of remote controller cable
Faulty remote controller cable
External factor (noise, etc.)
Check connection of
remote controller cable to
control PCB assembly on
terminal board.
Is
connection
cable between
main unit and remote
controller
properly
wired?
YES
Is
remote
controller cable
normal?
Note 1
YES
Disconnect cable from main unit terminal board and remote controller terminal board. Measure
resistance between wires in cable. Resistance should be
Check with power turned on.
With remote controller cable disconnected, voltage between P1 and P2 on terminal board should be
approx. 16 VDC. If measured value is not approx. 16 VDC, PCB assembly is faulty.
Connect remote controller cable and disconnect remote controller. Voltage at the end of remote
controller cable should be approx. 16 VDC. If measured value is not 16 VDC, remote controller cable is
faulty.
Connect remote controller cable and remote controller. Voltage between P1 and P2 on remote
controller terminal should be approx. 16 VDC. If measured valued is not 16 VDC, remote controller is
faulty.
JC J2 J1 F2 F1 P2 P1
5
Unit No.
5
NO
NO
Main unit PCB
Correct wiring.
Replace remote controller
cable.
Possibility of external factor
(instead of equipment error).
(HF008)
∞
MΩ (infinity).
P1 P2
LCD remote
controller
Remote
controller
for heat
recovery
ventilation unit
(HL032)

SiE71-202

Troubleshooting