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Sprayer Wiring Problems 
(cont.)

Motor thermal overload cutoff 
switch damaged.
Thermal Overload, page 7.

1. Unplug sprayer electrical cord.
2. Remove motor harness from control card
3. Check for continuity between yellow leads 

or motor harness. 

4. If thermal relief switch is open (no continu-

ity) allow motor to cool.

5. If switch remains open after motor cools, 

replace motor using Motor Kit, page 18.

6. If thermal relief switch closes after motor 

cools, find correct cause of overheating.

Terminals are damaged or 
loose

Replace any damaged terminals. Make sure all 
terminal connections are tight.

Building circuit breaker opens 
as soon as sprayer is turned on

Sprayer electrical wiring is 
pinched or insulation is 
damaged.

Repair or replace any damaged wiring or 
terminals. Securely reconnect wires.

Wires between pressure 
control switch and control 
board are pinched

Motor armature is shorting

Check for shorts using armature tester (growler) 
or perform spin test, Motor Diagnostics, page 
19. If shorts are evident, replace motor using 
Motor Kit, page 18.

Control board is damaged.
CAUTION: Do not perform 
control board diagnostics until 
you have determined the 
armature is good. A bad motor 
armature can burn out a good 
motor control board.

See Control Board Diagnostics, page 19. 
Replace control board if damaged using Control 
Board Kit, page 18.