I have a Bryant Furnace with the Bryant thermostat that came with the unit. This is a non-programmable thermostat and is powered by electric (no battery power). The problem is intermittent but while the furnace is running sometimes there is no display on the thermostat. Pressing the up/down tempature settings do not bring the display back automatically. After a few minutes the display will come back and then it will display HC for a moment and then display the current room tempature.

I don't want to call a furnace repair man to find out it is a simple fix on my end. Any adivse appreciated.

The model number of the furnace is CK5BXA030014AAAA