Found far right Heat Lamp bulb not on. Removed bulb and tested, found okay. Tested voltage to socket and found 115v. Ceramic insulator not attached to piece on top and came off. Put bulb back in and now working. Insulator was holding bulb too far out of socket not making contact. Will have to return in morning to tear unit apart to fix insulator. Will return in am. 8-14-20 Killed power to unit. Removed bulbs and dropped down unit. Installed ceramic insulator. Put unit back together and tested. Unit working normally at this time.