:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
37
E2: COMMUNICATION ERROR BETWEEN INDOOR UNITS AND OUTDOOR UNIT
DEFINITION
Outdoor unit cannot communicate with indoor units.
POSSIBLE CAUSES
• Communication wires between ODU and IDUs are installed incorrectly.
• Communication wires between communication and main control board are installed incorrectly.
• Incorrect power supply for all IDUs.
• Damaged main control or communication board.
• Communication wiring over 3937 feet.
• External interference (e.g. electromagnetic).
A210278
Fig. 43 —E2 Troubleshooting Chart
NOTE:
Make sure that the matched resistance has been connected in the last indoor unit.