Page 74
MS8C / MS8H (208-230V)
Indoor fan has malfunction or is damage.
Fan motor has a built-in thermal protection
circuit that may be stopping the motor due
to some type of abnormal operation.
Verify and correct wiring using the unit wiring
diagram.
Indoor fan is not
running.
The indoor fan capacitor may have an
open or damage circuit.
Replace indoor fan motor capacitor.
The compressor is
running but the
outdoor fan is off.
Compressor capacitor has malfunction.
The refrigerant is either low or high.
The capillary tubes are blocked which
may cause a temperature rise.
Compressor is running errantly or has
stopped.
The louver motor is
not running.
Check to see if louver motor was installed correctly
using the unit wiring diagram. If wired correctly, then
either the louver motor or indoor control has failed.
Replace indoor fan.
identify type of abnormal condition and
correct.
Indoor fan motor may be installed
incorrectly.
The outdoor fan motor has malfunction
or is damage.
The outdoor fan motor capacitor is
damage.
Replace outdoor fan motor capacitor.
Verify and correct wiring using the unit wiring diagram.
If malfunction continues, replace outdoor fan.
The compressor is
not running,
however the
outdoor fan is on.
Compressor has malfunction or is
damage.
Replace compressor.
Replace capacitor.
Voltage is either too high or low.
Check unit refrigerant operating pressure.
Compressor is installed incorrectly. Possible
wiring connections.
Verify and correct wiring using the unit wiring
diagram.
The compressor's thermal protection
circuits have malfunction.
Adjust refrigerant charge.
Replace capillary.
Replace compressor.
The compressor's thermal protection
circuits have malfunction.
The louver motor is installed incorrectly
The indoor control has malfunction and
may result in the louver(s) not operating
properly.
Use a multimeter to check the compressor overload
contacts. If the resistance is zero ohms, the thermal
protection circuit is open. if the compressor is not hot to the
touch, the thermal protection circuit should be replace.
The compressor is
running hot and the
overload protection
feature is cycling
compressor off.
In either cooling or
heating mode:
POOR SYSTEM OPERATION (ALL SIZES) (CONTINUED)
FIGURE 85
