Danstoker Poor Circulation / Pump Failure

Boiler overheats locally and trips on high limit, while system demand is low.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed circulation pump motor, Blocked strainers on Danstoker primary circuit, Closed isolation valves, Air lock in pump or piping

Safety: Allow boiler to cool before resetting high limit or opening any components.

Check pump operation: Listen and feel for vibration on the primary pump. If silent, check power, fuses, and motor protection.
Inspect valves: Ensure all valves around the pump and boiler are open.
Clean strainers: Isolate and clean any Y-strainers or filters in the primary circuit.
Bleed air: Vent air from the pump casing and high points to restore flow.

If circulation cannot be restored, the pump may need replacement by a heating technician.

Medium 3/5

Primary Circulation Pump

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