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Trouble shooting
Marine/RV trouble shooting

2016-10-18

Diaphragm Pump Trouble Shooting

Problem Cause Solution
Motor does not Start
 Electrical connections Blown fuse,main switch and ground connection
Motor hot Thermal Protect, wait until motor cool
Incorrect Voltage Use correct voltages (+/-10%)
Pressure switch  Replace new one
Can not prime
 Restricted inlet Check the strainer, hose,valves
Loose drive assembly tighten the screw
Air in the system check all fixtures
Incorrect Voltage Use correct voltages (+/-10%)
Pump can not shut off
 Restricted inlet Check the strainer,hose,valves
Loose drive assembly Tighten the screw
Air in the system check all fixtures
Incorrect Voltage Use correct voltages(+/-10%)
By-pass set higher than shut-off Lower it down
Noisy Restricted inlet Check the strainer,hose,valves
Air in the system Check all fixtures
Crude Mounting surface Install on flat surface
Loose drive assembly Tighten the screw and the mounting feet
Leaks Loose drive assembly Tighten the screw

Switch or pump assembly rupture

check the switch and pump head assembly and replace the kits,

such as pressure gasket, diaphragm,check valve etc.

Low pressure/flow Air in the system Check all fixtures
Leak Check all fixtures
Incorrect Voltage Use correct voltages (+/-10%)

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