My wall panel that I change settings on is a complete blank. I don't see a battery and I've checked so see if circuit breaker was tripped but it was not. Any idea what the problem might be.

Need to find out for sure if your stat requires batterys. Maybe contact the manufacturer of the stat. Other than that, it could be a bad stat, bad stat wire, or power problems at the furnace. Need to get your multimeter out and start checking for power to furnace, to control board, to transformer, out of transformer, etc. If you are handy with a multimeter, we can try to take this one step at a time.

The float switch had been moved in the furnace pan and turned off the system. It was an easy fix for the repair man. Thanks

Thanks for the update, we always appreciate that. Take care.