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mrcool.com
Maintenance
Unit Maintenance
Number Error Code Error
22
23
25
26
27
PL Bus low-voltage protection
PH Bus high-voltage protection
PU Charge loop error
ee Driver memory chip error
e1 High pressure sensor error
C4 ODU jumper cap error
24
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.
8)
Warning
1) Before cleaning, ensure the power is o. Turn o at circuit breaker and remove the disconnect to
avoid electric shock.
3) When cleaning the lter, be careful. If you need to work from an elevated position, such as a ladder,
please exercise caution.
2) Do not wash the air conditioner with water, otherwise re or electric shock may occur.
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