Edwards nES Series, Instruction Manual, Page: 48 / 56

Remedy Contact service department.
Cause Motor coupling damaged (if applicable)
Remedy Contact service department.
Cause Vanes worn out
Remedy Contact service department.
Cause Solid particles in the oil
Remedy Change oil.
Fault Pump runs hot
Cause Wrong oil type
Remedy Replace oil.
Cause Poor room ventilation
Remedy Install an auxiliary fan.
Cause Fan defect
Remedy Contact service department.
Cause Wrong power supply to motor
Remedy Check.
Cause Discharge clogged
Remedy Check couplings at outlet.
Fault High oil consumption
Cause High working pressure (close to atmospheric pressure)
Remedy Check oil level frequently.
Cause Pump runs hot
Remedy Refer to Pump runs hot on page 44.
Cause Exhaust filter element clogged
Remedy Replace.
Fault Pump does not maintain vacuum after power-off and pump leaks oil
Cause Check valve damage
Remedy Contact service department.
Cause Tank screws or plugs loose
Remedy Tighten.
Cause Tank gaskets damaged
Remedy Contact service department.
Page 44 - 07/2020
A35104880_B - Fault finding