Controller RH reading high

Question

Controller RH reading high

I have an S 2000 model. According to my thermostat, the relative humidity in the house is 22% when I check the controller attached to the HVAC it is displaying a relative humidity of 58. So the humidifier will not fill when I push the OD temp button it is showing 99. The current temperature outside is approximately 28°F. I have tried powering off and powering on, unplugging and plugging things back in, the valve is open, and I’ve tried turning off and turning on the circuit breaker to reset everything. When I increase the relative humidity on the controller to 60% the unit fills, but I know that is not a good solution because we have gotten condensation in a bathroom to the point that the drywall was damaged. Please help the HVAC company that installed this unit does not know what the problem is or how to fix it.

Status: Open Feb 02, 2026 - 05:33 AM

1answer

Answer

Feb 02, 2026 - 05:33 AM

If the OD sensor is reading 99, then the humidistat is not sensing the outdoor sensor properly. You can try operating the humidistat in manual mode, as this may correct the issue and prevent the humidistat from reading too high. If this does not resolve the problem, the only remaining option would be to replace the humidistat.

Controller RH reading high

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