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28 
Troubleshooting Mechanical and Electrical Problems 
Trouble Probable 
Cause 
Remedy 
No incoming power. 
Verify unit is connected to power, on-
button is pushed in completely, and 
stop-button is disengaged. See page 
24. 
Building circuit breaker trips or fuse 
blows. 
Verify that jointer is on a circuit of 
correct size. If circuit size is correct, 
there is probably a loose electrical 
lead. Check amp setting on motor 
starter. 
Switch or motor failure (how to 
distinguish). 
If you have access to a voltmeter, you 
can separate a switch failure from a 
motor failure by first, verifying 
incoming voltage at 110/220+/-10% 
and second, checking the voltage 
between switch and motor at 
110/220+/-10%. If incoming voltage is 
incorrect, you have a power supply 
problem. If voltage between switch 
and motor is incorrect, you have a 
switch problem. If voltage between 
switch and motor is correct, you have 
a motor problem. 
Motor overheated. 
Clean motor of dust or debris to allow 
proper air circulation. Allow motor to 
cool down before restarting. 
Motor failure. 
If electric motor is suspect, you have 
two options: Have a qualified 
electrician test the motor for function 
or remove the motor and take it to a 
qualified electric motor repair shop 
and have it tested. 
Machine will not 
start/restart or 
repeatedly trips 
circuit breaker or 
blows fuses. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unit incorrectly wired. 
Double check to confirm all electrical 
connections are correct. Refer to the 
Wiring Diagram section to make any 
needed corrections.