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TROUBLESHOOTING GUIDE
Symptom
Motor does not run
Motor runs but
doesn't pump
4
EN
Possible Cause(s)
1. Fuse blown
2. Switch defective
3. Switch or electrical
connections are faulty
(models M-150S-AU,
M-150S-EM, M-150S-
MU, M-180S-AU and
M-180S-MU)
4. Circuit breaker tripped
5. Motor burned out
1. Gear coverplate or
O-ring damaged
2. Strainer clogged
or defective
3. Suction pipe clogged,
damaged or missing
4. Bypass poppet O-ring
worn or missing
5. Bypass poppet O-ring
dirty
6. Bypass poppet binding
or damaged
Corrective Action
1. Inspect fuse in fuse holder on
power cord. If blown, replace
2. Remove switch coverplate
and inspect switch. Replace,
if necessary
3. Inspect for damaged motor
protector, defective wiring or
switch, or improper electrical
connections. Replace as
needed and reinstall
4. Turn power off at source.
Inspect the pump thoroughly;
clean or repair. Reset circuit
breaker by turning the power
switch off then back on
5. Replace motor
(see Maintenance /
Repair section)
1. Remove and inspect the
coverplate and O-ring.
Replace, as necessary.
(see Maintenance /
Repair section)
2. Remove strainer coverplate.
Remove and clean strainer.
Install again
3. Remove pump from tank.
Inspect suction pipe. Clean
or replace, as necessary
4. Inspect O-ring (see
Maintenance / Repair
section). Replace,
if necessary
5. Remove poppet assembly
and clean poppet and cavity
6. Remove the bypass poppet,
spring, and O-ring. Clean
cavity. Inspect and replace
components, if needed
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