• Check that the input supply voltage is 415V.
• Check that all three phases (R, Y, B) are present.
• Ensure the MCB is switched ON.
• Make sure the unit ON switch on the controller is in the ON position.
• Check the input supply connection.
• Check the motor connection.
• Check whether the motor is drawing higher current than its rated current.
• Check the motor connections at the panel and at the motor terminal.
• Interchange any two of the R, Y, B wires at the control panel terminals.
This indicates a phase-related fault – SPP (Single Phasing), VUB (Voltage Unbalance) or RP (Reverse Phase).
• Check that all three phases (R, Y, B) are present.
• Check the phase sequence of the input connection and interchange wires if required.
• Check the phase-to-phase voltage.
• Check the water level at the sump – if no water is present, the panel trips on a Dry Run fault.
• Check the dry run current setting in the control panel.
• Check the overload current setting in the control panel.
• Check the motor condition – it may be drawing more current than normal.
The input supply voltage is higher than the high voltage setting in the control panel.
• Check the high voltage setting in the control panel.
• Wait for the supply to return to a normal level.
The input supply voltage is lower than the low voltage setting in the control panel.
• Check the low voltage setting in the control panel.
• Wait for the supply to return to a normal level.
• Check whether the upper tank is actually full.
• Confirm the float connections are correct.
• Check the water level in the sump.
• Confirm the float connections as per the connection diagram.
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