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Potterton Solar - Solar Thermal Domestic Hot Water System 27
5.0 Fault finding
Y
ES
Pump symbol on controller rotates
b
ut pump does not operate
P
ump fault
Replace pump
Is controller to
pump connection correct
a
nd secure
YES
Is the pump siezed
NO NO
N
O
Y
ES
C
an the impeller be
revolved using a screwdriver
after removing the air
bleed screw
Free impeller and replace
a
ir bleed screw
Check connections and
rectify as necessary
YES
Displayed temperatures on controller
vary greatly over short time intervals
Controller fault
Replace controller
Are sensor cables
laid alongside mains
voltage cables
NO
Have sensor cables
been lengthened with
unshielded cable
NO
NO
Do sensors give
correct temperature
v
resistance readings
YES
YES
NO
Are sensor
connections correctly
made
YES
Sensor fault
Replace sensor
Use shielded cable to extend
sensor cable lengths
Seperate sensor cables from
mains cables (Min. 50mm
recommended) or use
shielded cable
Rectify sensor connections