• 215: Unable to communicate with Fan 2.
• 315: Unable to communicate with Fan 3.
• 415: Unable to communicate with Fan 4.
47. If any of these errors appear, check the communication wiring at the problem fan and the fan
before it.
48. If the wiring is correct and properly wired to the terminal, repeat the fan addressing procedure
in steps 30 through 36.
49. If none of the errors in step 46 is displayed, press the ESC button.
11.3.1 Verify the Fan Address
Verify that each fan has a unique address by:
1. Use the Up or Down arrow until C-- is on the display.
2. Press the ENT button.
3. In the Manual/System Control Selection parameter use the Up or Down arrow until C24 is on
the display.
4. In the Manual Control configuration parameter, press the ENT button.
5. Use the Up or Down arrow to select 0.
6. Press the ENT button. The display will read 888 if the command was accepted.
7. Press the ESC button for C24 to show on the display.
8. Use the Up or Down arrow until C34 is on the display.
9. Press ENT button.
10. If Fan 1 is running, the fans speed should be displayed in terms of percentage of full speed. If
Fan 1 is not running, 0.00 should be displayed.
11. Use the Up or Down arrow to enter 100% speed.
12. Press the ENT button. The display will read 888 if the command was accepted.
• Fan 1 should speed up to 100%, and all the other fans should stay the same speed.
13. If Fan 1 is not running or if any of the other fans also speed up to 100%, the fan-addressing
procedure ( steps 30 through 36) must be repeated.
14. Press the ESC button for the parameter to be shown on the display.
15. Repeat steps 3 through 8 for the rest of the fans, if present.
• C35: for Fan 2.
• C36: for Fan 3.
• C37: for Fan 4.
16. All fans should be at 100% speed.
17. Use the Up or Down arrow until C24 is on the display.
18. Press the ENT button.
19. In the System Control configuration parameter, use the Up or Down arrow to select 1.
20. Press the ENT button. The display will flash 888 if the command was accepted.
21. Press the ESC button for C24 to be shown on the display.
All fans should return to a normal speed based on the pressure input and the state of indoor unit’s
compressor.
Vertiv | Liebert® MC™ Installer/User Guide | 115
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