Stelpro Display Data / LCD Failure

Thermostat display is on but completely blank or shows only backlight

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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

Loose LCD ribbon cable, Failed LCD controller on Stelpro board, Firmware crash during boot, Physical damage to display glass

How to Fix / Troubleshooting

Safety: Turn off power at the breaker before removing the thermostat from the wall.

Steps to troubleshoot blank display:

  • 1. Power cycle: Turn the breaker OFF for 1–2 minutes, then ON. Watch for any logo or text during boot.
  • 2. Check app connectivity: See if the thermostat still appears in the Stelpro app and responds to commands. If so, the issue is likely limited to the display.
  • 3. Inspect for cracks: Look closely for hairline cracks in the display. Any physical damage usually requires replacement.
  • 4. Reseat display connector (advanced): With power OFF and thermostat opened (if serviceable), gently reseat the LCD ribbon cable on the main board.
  • 5. Firmware recovery: If the app allows, attempt a firmware update or recovery procedure.
  • 6. Replace thermostat: If the display remains blank and the unit is unresponsive, replace the thermostat.

Note: A blank display with working heat control may still be operated via the app temporarily.

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Repair Difficulty

Medium 3/5

Required Part

Stelpro Smart Thermostat Display Module
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