When your wall thermostat fails to kick on your heating or cooling system even though the indoor temperature has crossed your programmed setpoint, it points to several potential electrical or calibration faults. A frequent cause is a dead battery or a blown low-voltage control fuse on your indoor furnace control board, which cuts off power to the thermostat relay switches. Another common issue is accumulated dust and dirt inside the thermostat housing or misaligned internal temperature sensors that prevent accurate readings. Additionally, loose low-voltage wire connections at the wall sub-base can block control signals from reaching your HVAC equipment. You can troubleshoot by replacing batteries, cleaning the interior, and checking wire terminals. You can verify resolution when the thermostat clicks and successfully triggers your heating or cooling system to start.
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