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Dan it sounds like we have lost voltage from the indoor unit. Do you have a volt meter for troubleshooting? If so give me model on indoor unit and I can guide you in troubleshooting.Also anything happen recently such as electrical work or someone weedeating around outdoor unit that could have shorted a control wire?
Normally when this happens, there is a small auto type fuse in the air handler that you will find blown. However there is a cause that it blew which needs to be corrected. That can be a skinned control wire, a wire chewed by animal, or a defective component. If this is the case, until corrected a new fuse would also blow. On occasion installer will install a float switch in drain to break the 24v if drain gets stopped up.guidance, you can return to question for up to 30 days at no additional costs.
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If you decide to call in a tech, you would need the heating and a/c contractor. Most electricians will not know where to start other than verifying we have power to unit.