Glow-worm Motor Pump Saunier Duval GLOWWORMS1061900

The Glow-worm S1061900 is a motor pump — the circulation pump assembly that moves water around the appliance's heating circuit. It is supplied under the Glow-worm part number and carries Saunier Duval branding on the component itself. The pump sits in the standard water heater family of parts and provides the flow that carries heat from the heat exchanger to the rest of the system.

• The pump body runs hot but the appliance stays cold, or the flow pipe does not warm up.
• Grinding, whining or rumbling noise from the pump head when the appliance is running.
• The appliance locks out or trips on an overheat or no-flow fault.
• Water weeping from the pump body, the joint faces or the seal area.
• The pump does not spin up when the appliance calls for heat, even with the electrical supply confirmed at the terminals.

• Read the part number from the appliance data badge and match it against S1061900 before ordering.
• Compare the pump body, port positions and electrical plug arrangement with the unit being replaced.
• Isolate the water and electrical supplies before removing the old pump.
• If a gasket or O-ring is disturbed during removal, fit a replacement at the same time to avoid a leak on refill.