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SDi Decades Extreme Service Manual www.ecoer.com
May. 2023Manufacturer reserves the right to change specifications or designs without notice.
8.7.25 EL 16(Communication malfunction between adapter board and outdoor main
board diagnosis and solution)
Description: The adapter PCB cannot detect the main control board.
Recommended parts to prepare:
• Connection wires
• Adapter board
• Outdoor main PCB
Troubleshooting and repair:
Does the error still exist?
Replace the outdoor
main control board
Does a problem remain? The unit is operating normally
NO
Check the wirings and connections
YES
Are all the
connections good?
Ensure proper connections
NO
YES
Replace the adapter main PCB
The problem is solved
NO
8.7.26 Indoor and outdoor mismatch malfunction diagnosis and solution
Description: Indoor and outdoor units are mismatched, the LED displays this code. Please replace the
matching indoor or outdoor unit.
Power off, then restart the unit after 3 minutes.
YES
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