Danfoss PAHT Operation, Installation, And Maintenance Manual page 86

Operation guide
Trouble shooting
Closed water systems
No
.
Fill water into the system
.
Trace leakage, if any
86 | 180R9288_AQ109686503100en-001301
Installation, Operation and Maintenance Manual for PAHT 20-90 pumps
.
Is there su cient water
in the tank?
Yes
.
Is the electric motor of
No
the pump unit rotating?
Yes
.
A blown fuse/or short
circuit?
.
Check power supply
and fuses and contact
electrician
The system
does not work
.
.
No
.
Is the water in the tank
Yes
o
very hot? Ie above 50
No
Is the power supply ok?
Are control lights on?
Yes
.
Is the lter clogged?
.
Yes
Is the lter control
light on?
No
Contact serviceman
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.
At temperatures
o
higher than 50 the
pump drive cuts out.
Consequently the
cooler must be
checked/cleaned
.
Replace lter element
Stamp