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TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM
Motor hums and runs slowly or
not at all
Reset mechanism cuts out
repeatedly or fuses blow
repeatedly
POSSIBLE CAUSE(S)
1. Low voltage or no voltage
2. Shorted or open motor winding
3. Malfunctioning check valve or unloader
valve
4. Malfunctioning pressure switch - contacts
will not close
1. Pressure switch set too high
2. Malfunctioning check valve
3. Incorrect breaker/disconnect size
4. Malfunctioning motor
5. Loose Wiring
13
CORRECTIVE ACTION
1. Check with voltmeter, check line voltage to unit. If
overload or reset switch trips repeatedly, find and correct
the cause. See next item
2. Replace motor
3. Replace check valve or unloader valve
4. Repair or replace pressure switch
1. Adjust or replace
2. Clean or replace faulty valve
3. Be sure that breakers/disconnect are rated properly
4. Replace motor
5. Check all electrical connections
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