Gledhill Poor Primary Circulation / Balancing Issue

Gledhill thermal store pump runs but radiators or hot water do not heat properly

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Safety Warning

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.

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Possible Causes

Air locked in primary circuit, Pump installed backwards or incorrect speed, Blocked strainers or filters, Sludge build‑up in primary pipework

How to Fix / Troubleshooting

Safety: Allow the system to cool before bleeding or opening any parts. Use protective gloves and eye protection when dealing with sludge or chemicals.

Steps:

  • Bleed system: Bleed radiators and any high‑point vents to remove trapped air that can impede circulation.
  • Check pump orientation: Confirm the pump arrow points in the correct direction of flow as per the Gledhill schematic.
  • Clean strainers: Some systems have Y‑strainers or magnetic filters on the primary return. Isolate, remove, and clean these thoroughly.
  • System flush: If sludge is suspected, a heating engineer may need to power‑flush the system and add inhibitor.

Note: Poor circulation can also cause boiler cycling and noise; resolving it improves efficiency and reliability.

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Repair Difficulty

Hard 4/5

Required Part

Primary Circulation Pump
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