For parts or assistance, call Master Plumber Pump Customer Service at
1-800-628-9439
Maintenance / Troubleshooting
6
Flood hazard. May cause personal injury
or property damage.
Failure to make this operational
check can lead to improper operation, premature pump
failure and flooding.
AIRLOCKS:
When a pump airlocks, it runs but does not move any
water. An airlock will cause the pump to overheat and
fail.
This pump has a small hole in the side of the pump
housing. See Figure 3. This is an anti-airlock valve. If
you suspect an airlock, insert a hat pin or a pipe cleaner
into the anti-airlock hole to clean out the debris.
Troubleshooting
SYMPTOM
PROBABLE CAUSE(S)
CORRECTIVE ACTION
Pump won’t start
Blown fuse.
If blown, replace with a fuse of proper size.
or run.
Low line voltage.
If the voltage is under the recommended minimum, check the size
of the wiring from the main switch on the property. If OK, contact
power company or hydro authority.
Defective motor.
Replace the pump.
Defective float switch.
Replace the float switch.
Float is obstructed.
Remove the obstruction.
Pump starts and stops
Backflow of water from
Install or replace the check-valve.
too often.
piping.
Faulty float switch.
Replace the float switch.
Pump won’t shut off.
Defective float switch.
Replace the float switch.
Restricted discharge
Remove the pump and flush the discharge piping.
(obstacle in piping).
Float obstructed.
Remove the obstruction.
Pump operates but
Low line voltage.
If the voltage is under the recommended minimum, check the size
delivers little or no
of the wiring from the main switch on the property. If OK, contact
water.
power company or hydro authority.
Vent hole is plugged.
Clean out the vent hole.
