Lochinvar SPS0250 Faults, causes and rectification, Pump doesn’t run when power is switched on

SL-PS Installation & Operation Manual

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.

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