E09
Gledhill Supply Voltage / Power Input Fault

E09 on display, unit intermittently shuts down or resets

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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

Low or fluctuating mains voltage, Loose live/neutral connections at fused spur, Faulty internal power supply on PCB, Shared circuit overloading

How to Fix / Troubleshooting

Safety: Work on mains connections only if you are competent. Otherwise, call an electrician.

Steps:

  • Check fused spur: Ensure the isolator is rated correctly (usually 13A) and that the fuse is intact and firmly seated. Replace a suspect fuse with the correct rating only.
  • Tighten terminals: With power off, remove the fused spur cover and check that live, neutral, and earth conductors are tight and not heat‑damaged.
  • Dedicated supply: Confirm the water heater is on a dedicated circuit as per Gledhill’s installation instructions. Overloaded circuits can cause voltage dips.
  • Internal inspection: Look at the PCB for swollen capacitors or burn marks around the low‑voltage power supply section. If present, the PCB should be replaced.

Note: Persistent E09 with correct wiring may indicate a supply issue from the property side; an electrician should test the incoming voltage and circuit loading.

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Repair Difficulty

Medium 3/5

Required Part

Main Control PCB (Power Supply Section)
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