Thanks for the Service Tech Handbook Schleven. Still the same issue. I entered Diagnostic mode and but couldn't check anything because of the error. I cleared the error and retried and the error came right back.
Both of the new thermistors read 66k ohm in my cold MN basement, which is in spec for a 50k thermistor. Rechecked the wiring and nothing is open. In the last week I also replaced the control and interface board thinking that may be the problem...no luck.
If I should have a 5K ohm thermistor what would that part be...I can't find such an animal?