Potterton Pump Predisp/Terminal Block M3 Wiring 5141497

The Potterton pump predisposal terminal block M3 wiring is a wiring connection component used in the pump predisposal circuit of Potterton Commercial appliances. It provides the termination point for the M3 pump predisposal wiring within the boiler's electrical control arrangement. It is supplied by Potterton under part number 5141497.

• Scorching, discolouration or blackening around the terminal positions
• Melted or brittle insulation on the wiring entering the block
• Loose, corroded or stripped screw terminals that will not clamp the conductor securely
• Intermittent pump operation or a pump that fails to run due to a poor connection at the block
• Visible arcing marks or a burning smell local to the terminal block

• Confirm the appliance model and output variant matches one of the listed Sirius 2 WH units
• Check the existing terminal block is marked M3 and that the pump predisposal wiring arrangement matches
• Inspect the wiring ends and terminal positions against the failed part before fitting
• Isolate the electrical supply to the boiler before removing or refitting any wiring component