Friedrich MRM09Y1J, Service & Parts Manual

Page: 106 / 135

106 PB
TROUBLESHOOTING
High temperature and Overload Protection Diagnosis
Is outdoor ambient temperature in normal range?
Are the outdoor and indoor fans operating normally?
Is the heat dissipation environment inside and outside the unit is good?
(AP1 below refers to the outdoor control panel)
End
Y
Y
N
Y
N
N
Y
N
Overheat and high
temperature protection
Is outdoor ambient temperature higher than 53?
20 minutes after the complete
unit is powered off.
Is heat dissipation of the indoor unit
and outdoor unit abnormal?
Improve the heat
Normal protection, please operate
it after the outdoor ambient temp-
erature is normalized.
dissipation environ-
ment of the unit
Does the outdoor fan work normally?
Replace the
control panel AP1
Replace the
outdoor fan
1. Check if the fan terminal OFAN
is connected correctly
2.
Unplug the fan hub , ohms table Fan
measuring between any two end
terminals of the resistor , resistance is less
than
1KOhm