Mitsubishi Electric MSZ-GL18NA Operating Instructions Manual page 10

W
HEN YOU THINK THAT TROUBLE HAS OCCURRED
Even if these items are checked, when the unit does not recover from the
trouble, stop using the air conditioner and consult your dealer.
Symptom
Indoor Unit
Multi system
Outdoor Unit
En-9
Explanation & Check points
Symptom
Remote controller
Does not cool or heat
Sound
In the following cases, stop using the air conditioner and consult your
dealer.
Explanation & Check points