Thermostat does not control humidity as expected; indoor humidity remains high despite dehumidification settings

Safety: Turn OFF power before adjusting wiring; configuration changes can be done with power ON.

• Verify hardware: Confirm that your Ruud system actually supports dehumidification (e.g., variable-speed air handler with dehumidify input, or a whole-house dehumidifier).
• Enable feature: In the thermostat settings, enable dehumidification control and set a realistic humidity setpoint (e.g., 45–50%).
• Check wiring: If a dehumidify terminal (DHUM, DEHUM, or ACC) is used, verify it is correctly wired to the Ruud air handler or dehumidifier control input.
• Sensor accuracy: Compare the thermostat humidity reading with a separate hygrometer. If far off, the internal humidity sensor may be faulty (see humidity sensor fault steps) and the thermostat may need replacement.
• System capacity: In very humid climates, the HVAC system alone may not be able to reach low humidity setpoints without a dedicated dehumidifier.