Troubleshooting For Normal Malfunction - Friedrich MWM09Y1J Service Manual

Measure the voltage of this foot to neutral
wire on the mainboard
Installation and Maintenance
Troubleshooting for
H6 malfunction
Stir the blade
with a tool to see whether
the blade rotates
smoothly
Tighten the screw; reassemble the blade, motor
and shaft bearing rubber base sub-assy to make
sure there is no foreign object between them
yes
no
Check if the connection of PG
motor feedback terminal is firm.
yes
no
Check if the connection
of PG motor control
terminal is firm.
yes
no
Turn on the
unit again ; measure whether the output
voltage on control terminal for PG motor
is more than 50V within 1 min after the
louvers are opened
yes
no
no
Replace the mainboard
with the same model.
End
no
Is malfunction
eliminated
no
Insert the control
terminal of PG
motor tightly
Is malfunction
eliminated
no
Reinstall the blade and
motor correctly
Is malfunction
eliminated
yes
Is the motor
started up
no
Replace PG motor
Is malfunction
eliminated
yes
yes
yes
yes
yes