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10
Faults, causes and
rectification
Pump doesn't run when power is
switched on :
■ Check solar control unit for correct settings and tight wire
connections.
■ Check fuses.
■ Check pump voltage, refer to the pump rating plate for
requirements.
Motor blocked:
■ Close shut-off instruments upstream and downstream of
pump at high liquid temperatures and system pressures.
Allow pump to cool first.
■ Fully unscrew bleed screw and check ease of movement of
pump rotor by turning the slotted shaft end with a
screwdriver; use force to turn if necessary.
Pump Noise:
■ In the event of cavitation caused by insufficient inlet
pressure, increase primary system pressure within allowable
range.
■ Check speed setting.
If the fault cannot be rectified, please contact your nearest
Lochinvar/TiSUN customer service representative.
SL-PS Installation & Operation Manual
15
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