E20
Gledhill
Pump Overrun / Feedback Fault
E20 error, unit indicates pump overrun or stuck on
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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
Pump relay welded closed, Incorrect wiring causing permanent live to pump, Feedback signal from pump not detected correctly, PCB logic fault
How to Fix / Troubleshooting
Safety: Isolate power before opening the unit or touching pump wiring.
Steps:
- Check pump operation: With no demand and power on, the pump should stop after any programmed overrun. If it runs continuously, suspect a stuck relay or mis‑wiring.
- Wiring verification: Compare pump wiring to the Gledhill wiring diagram. Correct any permanent live feeds that bypass the PCB.
- Relay inspection: Examine the PCB pump relay for signs of overheating. If welded contacts are suspected, replace the PCB.
Note: Continuous pump operation can cause unnecessary wear and may mask other faults; resolve E20 promptly.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB (Pump Relay)
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