Guideline
Trouble shooting guide for PAH, PAHT, PAHT C , PAHT G pumps
62
180R9379 | AQ188686503004en-000801 | PAH 2-12.5 } 07.2022
1.
No flow/no pressure
Cause
Remedy
Comments
1 .1 Dry running
(no water supply to the pump)
If no water comes out of the pump:
1 .1 .1 Check that inlet valve is open .
1 .1 .2 Check that booster pump is running .
Mount a low pressure switch in front of the
pump and check its set point/ function . The low
pressure switch ensures that the pump does not
start until the inlet pressure has reachedmini-
mum inlet pressure (see Data sheet) .
1 .2 Pump reversing
(electric motor is running the wrong direction,
i .e . counter-clockwise)
1 .2 .1 Change the phase on the electric motor to
make it run clockwise .
WARNING:
- The pump must not run without water for
more than a few seconds .
- If the pump takes in water from the high-
pressure outlet line, it builds up pressure in
pump housing and will eventually break
down .
Rotation direction for the pump is shown by an
arrow on the label on the pump .
1 .3 No rotation of electric motor
1 .3 .1 Check that main switch is switched on .
1 .3 .2 Check the electricity at the facility .
1 .3 .3 Ensure that motor relay is switched on .
1 .3 .4 Ensure that fuse is not blown .
1 .3 .5 Ensure that booster pump is started .
1 .3 .6 Check that the monitor switches are
working correctly .
1 .3 .7 Disconnect pump from electric motor and
check that the motor is capable of running
with no load .
If motor-type relay or the electrical fuse is
blown, check that electric motor is sized
correctly .
1 .4 No rotation of pump
1 .4 .1 Ensure that coupling between electric
motor and pump is connected .
1 .4 .2 Check if coupling is damaged .
1 .4 .3 Check that electric motor is sized correctly .
1 .4 .4 Check that the electrical installation is
correctly sized .
1 .4 .5 Contact Danfoss Sales office for guidelines
in how to troubleshoot internal pump
parts .
1 .5 Axial load on pump shaft
(may cause high internal leakage)
Only applying to
PAH 2-12 .5
PAHT 2-308
PAH F 20-40
PAHT C 2-308
PAHT G 2-308
1 .5 .1 Ensure that the air gap between the two
coupling parts is min 5 mm . It should
always be possible to move the plastic part
on the coupling at least 3 mm .
To ensure easy mounting of the flexible coupling
without using tools, the tolerances must be
dimensioned accordingly .
WARNING:
Any axial and/or radial loads on the shaft must
be avoided . Any axial or radial load will cause
breakdown .
1 .6 Pump damage
(the internal parts may be damaged)
1 .6 .1 Contact Danfoss sales office for guidelines
in how to troubleshoot internal pump
parts .
Instructions on internal elements are available
on www .danfoss .high-pressurepumps .com
A
B
C
A - Bell housing
B - Flexible coupling
C - Motor shaft
Summary of Contents for PAH 2
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