Troubleshooting - Danfoss PAHT 2 Operation, Installation, And Maintenance Manual

Trouble shooting
Open ended water systems
Operating guide
.
Is water coming
out of the tap?
No
.
Are all taps open?
Yes
.
Is the control light
Yes
for "low pump suction
pressure" on?
.
The lter is clogging
No
.
Is water coming
through the lter?
No
.
Replace lter element
.
Turn on the tap for
water supply
© Danfoss | 2023.09
PAHT 2-12.5 pumps
No water supply
No
.
Is the water supply ok?
.
Is water supplied to the pump?
Yes
.
Is the electric motor of
the pump unit rotating?
Yes
Yes
.
Is the water in the tank
No
very hot? Ie above 50
No
.
Is the power supply ok?
.
Are control lights on?
Yes
.
Is the lter clogged?
No
.
Is the lter control
light on?
Yes
.
Replace lter element
Contact serviceman
180R9287_AQ073186503097en-001004 | 93
.
Lower inlet
Yes
temperature or
o
provide better cooling
No
.
A blown fuse / or short
circuit?
.
Check power supply
and fuses and contact
electrician
Stamp