Does anyone have any idea what 5 flashing lights mean on the series 1018 UT furnace controller. The manual that I have list 1 to 4 flashing lights, but not 5 flashing lights. I thought maybe the control was bad, so I swapped it out and got the same thing with the other controller. I figure it has something to do with flame sensing signal. Does anyone know what this error is referencing.
↧