Removing the Flame Sensor
To remove the flame sensor you'll loosen the screw on the top of the furnace over the second burner. Once the scree is loosened the bracket holding the flame sensor in place can be removed. Without detaching the flame sensor from the furnace, you can use a piece of emery cloth to sand the build up for the end of the flame sensor. The build up insulates the end of the flame sensor so it doesn't heat up properly. When the thermocouple doesn't get hot enough it shuts down the gas control as a safety measure.
Reattaching the Flame Sensor
Reattach the flame sensor by putting back into the hole on the top of the furnace and tighten the screw on the bracket holding it in place. Make sure to check that the sensor is in the same position that you found it before you removed it for cleaning. Typically it will be positioned just over the second burner. When the furnace is reignited the flame sensor will be touching the flame so it can heat up correctly. When the flame sensor is able to detect that the flame is lit the gas supply will stay on, keeping the flame fed and allowing for heat to build up and warm your house.For a furnace that is cycling off too fast, or if you notice that your home isn't warming up a light sanding of the flame sensor may be your fix. You can add years of use to the life of the flame sensor just by giving it a light sanding once a season. If you are comfortable checking this item yourself, you can save money on a service call. But if you're not a DIY-er, contact a local HVAC Denver professional to come out and diagnose the problem.
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Well... it is very essential to clean furnace flame sensor. Here are some tips : To examine technical glitch first of all switch off the power then check. Most of the furnace flame sensors are attached with a drain hose or pipe. You must ensure that there is no blockage in the drain hose . You must check the wire connections of your furnace flame sensor. If you neglect this part, then it not only may affect the furnace flame sensor, but may also lead to cause any accident at your house. Get more tips at : http://www.constructioninvivo.com/how-to-clean-a-furnace-flame-sensor/
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