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How to Clean a Takagi Flame Sensor

If you are having problems with your Takagi water heater, the problem could very well be a clogged flame sensor. Flame sensors are metal cylinders that touch the flame of the water heater and tells the control board if the flame is on or off. It is a metal cylinder with an approximate width of ¼-inch and length of 1 to 2 inches. The exterior of the flame sensor gets covered with deposits and needs to be cleaned in order for it to work properly.


Step 1

Turn off the main gas valve connected to the Takagi water heater.  Unplug the water heater from the electrical outlet.


Step 2

Turn the screws in the case in a counterclockwise direction and remove the screws from the case, using a screwdriver. 


Step 3

Locate the manifold of the water heater.  The manifold is the rectangular piece that covers the combustion chamber.

Turn the screws in the case in a counterclockwise direction and remove the screws from the manifold.  Place the manifold in a safe place.


Step 4

Locate the damper of the water heater.  The damper is the thin rectangular piece with multiple holes.

It is located behind the manifold.  Turn the screws in a counterclockwise direction and remove the screws from the damper.

Place the damper in a safe place. 


Step 5

Locate the flame sensor.  The flame sensor is located in the center of the combustion chamber.

Turn the flame sensor in a counterclockwise direction to remove it from the combustion chamber.  Pull the flame sensor backwards to remove it.


Step 6

Rub the exterior surface of the flame sensor gently with steel wool to remove the deposit around the sensor. 


Step 7

Insert the flame sensor back into the combustion chamber.  Repeat Steps 1 to 4 in reverse order to reassemble the water heater.

Things You Will Need

  • Screwdriver
  • Steel wool

Warning

  • Wear heat resistant gloves when handling a flame sensor.