I have a Totaline thermost model P474-0100 which controls a NORDYNE heat pump model P3RC-042K. I went away for a few weeks and when I returned the Totaline thermostat will not work.
I am trying to see if the problem is the thermostat or something else. The LCD on the thermostat is blank, not lit. The light on the thermostat is not lit. I measure 28 volts on the thermostat between the R terminal (24v hot) and the C terminal (24v common). Does this sound like the problem is the thermostat? What else could I measure to prove or disprove where the problem is?
Thanks so much in advance.
Ron
I am trying to see if the problem is the thermostat or something else. The LCD on the thermostat is blank, not lit. The light on the thermostat is not lit. I measure 28 volts on the thermostat between the R terminal (24v hot) and the C terminal (24v common). Does this sound like the problem is the thermostat? What else could I measure to prove or disprove where the problem is?
Thanks so much in advance.
Ron