Mitsubishi Electric MSZ-FH06NA Notice D'utilisation page 13

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
Explanation & Check points
Symptom
Remote controller
Does not cool or heat
Sound
Timer
In the following cases, stop using the air conditioner and consult your dealer.
Explanation & Check points
En-12