Hello - I have a Tranquility 30 TE. It's about 8 years old or so. While the settings can be fickle, it's been a champ. Got a call from local utility company that my bill is going to be 96% higher this month. Huh? Then I notice that my unit has been running on Aux heat. It goes through stage 1 then 2, but the lt1 and lt2 never changes. Never puts out any heat. It then flips over to Aux. No compressor. No wonder the high bill are coming in! I have an hvac guy coming over Monday for a look. Thought I'd post here in case anyone has any idea. It is throwing NO fault messages on the thermostat unit. I've reset the breakers as that sometimes seems to reset things. No effect. I took the cover off and I notice the LED2 light has a slow red flash all the time, whether the unit runs or not. Don't know if that means anything. Any ideas? Thanks!