12-18-25 Engineered air direct fire warehouse heater. It’s not working again. They have a lift on site to access the unit Get up to the control box didn’t find the high temperature limit tripped. That was fine. Didn’t find any problems with the flame, flame and the flame sensor reading about 15 V DC. When I touched the high ambient control which is set for 60° the unit did come on. Currently the temperature outside is about 45°. I said the high ambient control to 75°. They should keep the unit running. This unit has a maximum discharge of 130° currently I’m getting about 145°out of the grills. The maxi control controller is set at 110°