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V4.0
Fuse/circuit
breaker
overloads.
Motor is
overheating.
Visit www.princessauto.com for more information
1/2 HP Furnace Electric Motor
1. There is a blown
fuse or open circuit
breaker.
2. Motor starter
overload activated.
3. Power enters
control circuit but
does not reach the
motor.
4. Low or no voltage
reaching motor.
5. Motor shaft does
not turn when
power applied.
1. Broken or
disconnected
ground.
2. Hot power lead is
connecting to the
motor frame.
3. Motor overloads
during operation.
1. Test for voltage at the fuse or circuit
breaker. Also see if the voltage/amp
rating of the fuse or circuit breaker is
correct for the motor. It should exceed
the Motor's FLC by 25 percent.
2. The thermal protector will automatically
reset and the motor will function
normally again once it has cooled. Test
the starter before starting motor again.
3. Begin by confirming all contacts are
clean and tight. Examine for obvious
damage.
a. Test each part of the circuit for
power until the problem area is
discovered.
b. Have a qualified service technician
repair or replace the circuit.
4. Check each motor terminal's voltage.
The voltage should be within 10% of
the voltage on the motor's nameplate.
Disconnect the load and apply power to
the motor. If the motor operates
normally, then the issue is with the load
attached to the motor. Should the
motor still not work, have it serviced or
replaced by a qualified technician.
5. Disconnect the motor from the load and
test under no-load conditions. If the
shaft does not turn, the bearing is
immobilized. Have the motor serviced
or replaced by a qualified technician.
1. Reconnect or replace the ground wire
and test for proper ground.
2. Have a qualified technician inspect the
motor and repair/replace the defective
wiring.
3. A moving part of the motor may be
binding. Inspect the motor to see if any
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