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Troubleshooting
PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Motor
1. Connections at control board and brushes 1. Repair any loose connections
2. Brushes worn. Length must be 1/2 in. minimum.
Check both sides.
2. Replace brushes. Page 9.
3. Broken or misaligned brush springs 3. Realign or replace springs
4. Brushes or springs binding in brush holder 4. Clean brush holder and align brush leads for
free movement
5. Check for armature short using an armature
tester (growler) or perform spin test. Page 9.
5. Replace motor
6. Check motor armature commutator for burn
spots or other damage
6. Remove motor and have motor shop resur-
face commutator if possible. Page 20.
Control board or wiring 1. Loose control board wiring 1. Repair any loose connections
2. Damaged control board 2. Replace control board
Control/sensor 1. Potentiometer damaged 1. Replace potentiometer
2. Pressure transducer damaged 2. Replace pressure transducer
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