Table of Contents
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Pump symbol on controller rotates
but pump does not operate
Is controller to
pump connection correct
and secure
YES
Is the pump siezed
NO
Pump fault
Replace pump
Displayed temperatures on controller
vary greatly over short time intervals
Are sensor cables
laid alongside mains
voltage cables
NO
Have sensor cables
been lengthened with
unshielded cable
NO
Do sensors give
correct temperature
v
resistance readings
YES
Controller fault
Replace controller
NO
Check connections and
rectify as necessary
Can the impeller be
YES
revolved using a screwdriver
after removing the air
bleed screw
NO
Seperate sensor cables from
mains cables (Min. 50mm
YES
recommended) or use
shielded cable
YES
Use shielded cable to extend
sensor cable lengths
Are sensor
NO
connections correctly
made
YES
Sensor fault
Replace sensor
YES
Free impeller and replace
air bleed screw
NO
Rectify sensor connections
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