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1
0
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9
The communication
fault between indoor and outdoor
Indoor display E7
Outdoor display LED1 flash 15 times
Method of Communication is detected by checking the indoor PCB and the outdoor PCB
Malfunction
Detection
Malfunction
■
The outdoor PCB broken leads to communication fault
Decision
■
The indoor PCB broken leads to communication fault
Conditions
Supposed
■
Communication wiring disconnected
Causes
■
The indoor PCB is broken
■
The outdoor PCB is broken
■
The Module PCB is broken
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
LED
LED 1
LED 2
Solution
ON/OFF
OFF
ON
Outdoor PCB fault
ON/OFF
ON
ON
This is caused by Outdoor PCB or Indoor PCB
fault. Change one part firstly, if still unsolved,
change another one
ON/OFF
OFF
OFF
This is caused by Outdoor PCB or Power module
fault. Change one part firstly, if still unsolved,
change another one
NO
Fix the connect cable
1.Check whether the connect cable is bad connection.
2. Check whether the LN wire reversal connection
3.Check whether the communication wire connection is tight
Yes
Check the outdoor PCB
LED
Domestic air conditioner
42
Seivice diagnosis
Summary of Contents for 1U26QE4ERA
Page 14: ...Operation range Domestic air conditioner 5 Operation range 12 10 0 20 16 32 10 20 15 ...
Page 64: ...Circuit diagrams 62 Domestic air conditioner ...
Page 65: ...Circuit diagrams Domestic air conditioner 12 2 Module board Circuit Diagram 63 ...
Page 70: ...Removal Procedure 2 Removal of Electrical Box 3 Domestic Air Conditioner ...