AC TROUBLESHOOTING CHART
Symptoms
Possible Cause(s)
Suggested Remedies
Pump will not
start or run
1. Water level too low
2. Blown fuse or tripped circuit breaker
3. Low supply voltage
4. Motor
5. Switch
6. Inlet screen clogged
7. Switch obstruction
1. Water must be at the appropriate level to activate switch
2. If blown, determine cause and then either replace with proper
sized fuse or reset breaker
3. Contact an electrician
4. Replace pump
5. Replace unit if switch is broken
6. Remove debris
7. Remove obstruction to ensure free motion of switch
Pump starts and
stops too often
1. Back-flow of water from discharge
pipe
2. Switch
3. Check valve not functioning properly
or leaking
1. Install check valve
2. Replace unit if switch is broken
3. Remove and examine check valve for prop er in stal la tion and free
operation. Replace check valve if necessary.
Pump shuts off
and turns on
independently
of switch (trips
thermal overload
protection)
1. Excessive water temperature
2. Switch
3. Switch obstruction
4. Obstruction in discharge pipe
5. Low supply voltage
1. Pump should not be used for hot water
2. Replace pump
3. Remove obstruction to ensure free motion of switch
4. Remove obstruction in discharge piping
5. Contact an electrician.
Pump operates
noisily or vibrates
excessively
1. Worn bearings
2. Impeller broken
3. Piping attachments to building
structure too rigid or too loose
1. Replace pump
2. Replace pump
3. Install rubber coupling (available at local hardware stores) to
isolate pump vibration from discharge plumbing
Pump will not
shut off
1. Switch
2. Switch obstructions
3. Restricted discharge (obstruction in
piping)
4. Excessive inflow or pump not
properly sized for application
1. Replace unit if switch is broken
2. Remove obstruction to ensure free motion of switch
3. Remove obstruction from discharge piping
4. Recheck all sizing calculations to determine proper pump size
Pump operates
but delivers little
or no water
1. Low supply voltage
2. Inlet screen clogged
3. Pump not properly sized for
application
4. Check valve stuck closed or
installed backwards
5. Shut off valve closed
1. Contact an electrician
2. Remove debris
3. Recheck all sizing calculations to determine proper pump size
4. Remove and examine check valve for proper installation and free
operation
5. Open valve
Pump trips GFCI 1. Bad GFCI
2. Bad pump
1. Contact and electrician to replace GFCI
2. Replace pump
Operating Instructions and Parts Manual
9
www.waynepumps.com
WSS30Vn
