I installed a Lux digital thermostat last summer for my Coleman Heat pump and furnace. It worked perfectly until now when I called for Emergency Heat. The high speed fan comes on but no heat. Ideas? Furnace is an EB10B

Sounds like maybe the furnace,which is your emergenct heat is not working. Check it out .the fan can be blowing but the heat strips or fas burners are not working,, not knowing which you have ,gas furnace or electric furnace

Each brand of heat pump seems to be wired a little differently. If you don't have the instructions for yours, see if you can find it on the net. Then compare what it needs to the thermostat directions. More help at https://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-frequently-asked-questions-58313.html