The system has some issue(s). There is a high probability that it is a clogged condensate tube that is tripping the float valve or a failed start capacitor. This has already been suggested as a possible cause. There are numerous other possibilities such as low refrigerant from a leak. Without the capability of checking the two highly probable reasons, the home owner should engage an HVAC professsional. It appears that the system may still be under a 10 year parts and 5 year labor warranty (unless the default warranty has changed since I bought my home new). Relative humidity is a strong function of temperature. You can drop the relative humidity by increasing the temperature with the same absolute amount of moisture in the air. The actual moisture content of the air is higher than it should be if the temperature set point was being met with 55% relative humidity. This means the system has not been running and removing moisture. I have never seen a properly functioning system sustain a 6 degree temperature difference between the actual temperature and the set point.
I have had both a clogged condensate drain and failed start capacitor cause my system to stop. I regularly pour vinegar and hot water down the condensate drain and preemptively replace the start capacitor every two years. It is a $15 part and takes 10 minutes to swap out. Yes, that is overkill but we are gone a fair amount.
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Originally Posted by Albany
It is probably fine. The humidistat overrides the AC, which will not come on until the humidistat hits 55 and activates it. It is simple to find out. Turn the humidistat to ON from the 55 setting. Wait a little, if the AC comes on you do not have a problem. The system is operating as it should. Then turn the humidistat back to 55.
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