Wat je nodig hebt
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Pushing in at the bottom of the thermostat, pull down and remove the thermostat from the wall. Note: the circuit breaker for the HVAC system MUST be off. Use caution when handling electrical wires.
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Locate the plastic tabs, and using a flat headed screwdriver, push them inward. This may take some force, but the plastic should give fairly easily.
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The board is exposed! Now simply push back the plastic tabs connecting the board and disconnect the cables
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Now that the board is removed, we see 8 3 volt relays, the temperature and humidity sensor (on it's own board) a small battery, and the microprocessor.
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The screen has 3 cables (the wide one is for the LCD, the skinny one if for the digitizer, and the simple, red and black one is for the backlighting.
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The screen and be opened to expose the LCD and the backlighting
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You've opened the Lennox Y049 Thermostat (or another similar model).
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