Friedrich MW09C1H Service Manual page 56

Mainly detect:
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?
Is outdoor ambient temperature higher than 53?
Is heat dissipation of the indoor unit
Does the outdoor fan work normally?
56
Overheat and high
temperature protection
N
20 minutes after the complete
unit is powered off.
and outdoor unit abnormal?
N
Y
Replace the control panel
AP1
End
Normal protection, please operate it after the
Y
outdoor ambient temperature is normalized.
Improve the heat
Y
dissipation environment
of the unit
1. Check if the fan terminal O FAN
is connected correctly
2. Resistance between any two
N
terminals is measure by an ohm
gauge and should be less than 1K
Ohm.
Replace the fan
capacitor C1
Replace the
outdoor fan
Troubleshooting