We have a 2 stage furnace for both heating and cooling. We intermittently are getting the E74 error in the Nest app. The schedule for heating is set to bring house temperature to 67 degrees at 6AM. The room where the nest is located does not come up to temperature until hours later - 10 AM or later. The furnace is cycling on and off continuously and we see the E74 error come and go.
Our C (blue) wire is connected to the WAUX terminal. The red wire is connected to the Rh terminal. White connected to the W terminal. The yellow connected Y1. The green to fan terminal.
Why is our furnace not heating our house to temp in a reasonable amount of time, why is it turning on and off, why are we getting the E74 error??????
