Heliocol
Controller Keypad or Interface Failure
Solar controller display is on but buttons do not respond or menus cannot be changed.
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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
Failed membrane keypad, Corroded keypad connector, Firmware lockup, Physical damage from UV or water
How to Fix / Troubleshooting
Safety first: Turn off power before opening the controller enclosure.
- Power-cycle controller: Turn power off for 30 seconds and back on to clear any temporary lockup.
- Inspect keypad cable: If accessible, reseat the keypad ribbon cable or connector on the controller PCB.
- Check for moisture or corrosion: Dry any moisture and clean light corrosion with contact cleaner. If the keypad overlay is cracked or delaminated, replacement is recommended.
- Replace front panel: If buttons remain unresponsive, replace the controller front panel or entire controller, depending on parts availability.
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Repair Difficulty
Medium
3/5
Required Part
Solar Controller Keypad/Front Panel
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