Customer spoke about past things done involving the hvac equipment. The blower speed has been slowed down, and refrigerant added. I confirmed that the refrigerant is correctly charged. I investigated reasoning behind the E2 error code and the high-ish humidity. The E2 code on the Aprilaire fresh air intake is caused by either restricted airflow/dirty filter, failed sensor, or high air temperature. I assume it’s the later that is causing the error code. The system is a single stage gas system. The thermostat is in range to be getting tricked by the supply air. I recommend adding scoops to the bedroom supply vents to advert the air. If the issue persists, we will either need to replace the thermostat with a 824 Trane w/ sensors or add a dehumidifier. I am putting in a service estimate request for pricing.