14
Hot Surface Ignition Models Service Manual
Ignitor Element Heats Up But Motor
Does Not Start Within Five Seconds
Rotate Fan by Hand to Determine
if Fan Rotates Easily
Fan is Difficult to Rotate
Fan Rotates Easily by Hand
Broken Rotor or Blades
Improper Rotor Clearance
Oversized Rotor
Dry Motor Bearing
Open Motor Winding
Defective Ignition Control Assembly
Defective Start/Run Capacitor
Improper Voltage to Heater
1
2
3
4
5
6
7
8
TEST PROCEDURE
1 Broken Rotor or Blades
Disassemble the end cover filter and end pump cover
from rear of motor. Visually inspect the rotor and blades
for breakage. Make sure that the rotor and blades are
free of any type of lubricant. Rotor and blades must be
clean and dry for proper operation.
2 Improper Rotor Clearance
Check rotor with feeler gauge for proper clearance
(.003"-.004") between rotor and pump body. Rotate ro-
tor and make sure all four quadrants of rotor have ad-
equate clearance.
3 Oversized Rotor
If the fan is hard to turn when the motor end cover is
installed, but easy to turn when loosened, the rotor should
be removed and lightly sanded. Remove the rotor and
lightly sand by placing rotor in the palm of hand and sand-
ing on a flat surface making figure eight rotations. (Use
the finest grade of sandpaper available).
OBSERVED FAULT
Blade
Rotor
Pump Body
Gap
Sandpaper
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