First put 110 V to the fan motor by disconnecting fan wires in control box. You can also jumper the fan switch at the control box halfway up the exterior of the heater.( the control box at the duct end of the heater is the limit switch). For the burner that doesn’t work, there is a solinoid valve to allow fuel to the burner. You can break open the copper fuel line that hooks up to the burner assembly to check if fuel shoots out. Also check the igniter if it is sparking. When the heater starts up lift the igniter up a quarter inch and look in there to see if you can see any spark. You also have a fire eye inside the burner compartment under the ignitor. Pull it off close lid and start heater. If it fires up and shuts down in 30 seconds, it’s your fire eye. After checking these item and still doesn’t start it is your controller.
|