I have it set to AC only, I don't have anywhere on this model for a code to display, it's supposed to blink the red light, but it hasn't done that at all, just goes red. Been my major issue, otherwise I'd just fix it by code. I got a new heating element coming in tomorrow. So I can replace it and hopefully that will be the issue.If it's getting cold but a certain length of time passes without a temperature change you'll probably get a DTC, so leave it run then read the code. Unless it has switched itself to gas?
