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10. Fault finding chart
Fault Cause Remedy
1. Dosing pump does a)
Not connected to the mains. Connect the power supply cable.
not run. b) Incorrect mains voltage. Switch off the pump. Check voltage and
motor. If the motor is faulty, return the
pump for repair.
c)
Electrical failure. Return the pump for repair.
2. Dosing pump does a) Leaking suction line. Replace or seal the suction line.
not suck in.
b)
Cross-section of the suction line too Check with Grundfos Alldos
small or suction line too long. specification.
c) Clogged suction line. Rinse or replace the suction line.
d) Foot valve covered by sediment. Suspend the suction line from a higher
position.
e)
Buckled suction line. Install the suction line correctly. Check
for damage.
f)
Crystalline deposits in the valves. Clean the valves.
g) Diaphragm broken or diaphragm Replace the diaphragm.
tappet torn out.
h) Empty dosing tank. Fill the dosing tank.
3. Dosing pump does
not dose.
a) Air in the suction line and dosing head.
Fill the dosing head and suction line.
b) Viscosity or density of medium too Check the installation.
high.
c) Crystalline deposits in the valves. Clean the valves.
d) Valves not correctly assembled. Assemble the inner valve parts in the
right order and check or possibly correct
the flow direction.
e) Injection unit blocked. Check and possibly correct the flow
direction, or remove the obstruction.
f)
Incorrect installation of lines and Check the lines for free passage and
peripheral equipment. correct installation.
g) Empty dosing tank. Fill the dosing tank.
h) Sealing elements not chemically
resistant.
Replace sealing elements.
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