Residential wall thermostats can fail due to a wide variety of electrical, environmental, and mechanical factors over their operational lifespan. One of the primary causes is electrical power surges or lightning strikes that travel through low-voltage control wiring and fry sensitive microprocessors on the circuit board. Another common culprit is battery acid corrosion leaking from aging alkaline batteries into internal contact terminals, destroying electrical conductivity. Physical damage from accidental impacts, excessive indoor humidity causing moisture condensation on internal solder joints, and normal electronic component fatigue over a ten-to-fifteen-year lifespan also contribute heavily to failure. You can determine that your thermostat has failed when it stops communicating with your HVAC system entirely despite receiving stable power.
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