Use and Care Manual

Page 36mrcool.com
Maintenance
Unit Maintenance
Number Error Code Error
21 P5 Over-current protection
22 P6 Master control and driver communication error
Driver module sensor error
24 P8 Driver module high temperature protection
25 P9 Zero-crossing protection
26 PA AC current protection
27 Pc Driver current error
28 Pd Sensor connection protection
29 PE Temperature drift protection
30 PL Bus low-voltage protection
31 PH Bus high-voltage protection
32 PU Charge loop error
33 PP Input voltage error
34 ee Driver memory chip error
35 C4 ODU jumper cap error
23 P7
NOTICE
When the unit is connected with the thermostat, the error code will show simultaneously
on it.
Warning
1) Only professionals may carry out annual maintenance.
2) Before contacting any wire, make sure power is turned o.
4) Do not use organic solvent to clean the air conditioner.
5) If you need to replace a component, contact a professional to repair the unit with a component supplied
by MRCOOL® to ensure the quality.
6) Improper operation may damage the unit, causing electric shock or re.
7) Do not immerse the air conditioner in water or electric shock may occur. Do not use water to rinse the
unit during cleaning.
3) Do not allow ammable objects near the unit.