E11
Gledhill Relay / Output Driver Fault

E11 error, unit will not start, sometimes accompanied by buzzing from PCB area

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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

Stuck or welded relay contacts on PCB, Burnt relay coil, Overloaded output (pump or valve drawing excessive current), PCB track damage

How to Fix / Troubleshooting

Safety: Isolate power before removing the front cover. Do not touch the PCB when energised.

Steps:

  • Visual inspection: Look closely at the PCB relays (small rectangular components). Check for discoloration, cracking, or burn marks on or around them.
  • Check connected loads: Identify what each relay controls (pump, immersion, boiler enable, etc.). Test those components for short circuits or excessive current draw before replacing the PCB.
  • Listen for operation: With the cover refitted and power on, call for heat and listen for relay clicks. A relay that buzzes or fails to click may be faulty.
  • Replace PCB: Gledhill generally supplies the PCB as a complete assembly. Label all wires, take a photo, then swap the board, transferring each connector one at a time.

Important: If a connected component is shorted, it can damage the new PCB. Always test pumps, valves, and immersions for correct resistance and insulation before fitting a new board.

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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB (Relay Section)
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