Danfoss APP Series Installation, Operation And Maintenance Manual page 117

Trouble shooting
Open ended water systems
.
Is water coming
out of the tap?
No
.
Are all taps open?
Yes
.
Is the control light
for "low pump suction
Yes
pressure" on?
.
The filter is clogging
No
.
Is water coming
through the filter?
No
.
Replace filter element
.
Turn on the tap for
water supply
No water supply
.
Is the water supply ok?
No
.
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 filter clogged?
.
No
Is the filter control
light on?
Yes
.
Replace filter element
Contact serviceman
.
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