Question about Heating & Cooling
The reset button near the ignitor is a high temperature limit safety switch. When the furnace gets too hot and the manual reset limit switch is tripped, it most likely goes into a 'safe' mode where the gas control is locked out electronically and the blower is made to run continuously to rid the heat exchanger of the excessive heat. This will continue until the reset is pushed and the power is cycled off. It will remain an endless cycle unless the reason for the overtemperature condition is not corrected.
Your furnace 'temperature rise' is getting too high due to a lack of air across the heat exchanger for whatever reason. Some of those reasons could be a restricted air filter or a blower motor that's cycling improperly on its internal winding thermostat. You could also have a dirty air conditioner 'A' coil (evaporator) on top of the furnace restricting the air flow. Nevertheless, you are going to have to have it serviced by a reputable service company's technician to correct what's wrong.
Posted on Nov 30, 2014
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Posted on Jan 02, 2017
The flame sensor is dirty. You can not see the build up on the sensor but enough build up will change the resistance and the furnace thinks there is no flame.
To clean the sensor, first you need to locate it. it will be a sensor located in the path of one of the flames. Once you locate the sensor, open the bottom panel to turn"off" the furnce. After the panel is removed, unscrew the sensor from the frame above the jets. Use a clean rag and gently wipe the sensor several times. Place back in the cut out and close the lower panel.
The furnace should cycle on and the flame stay on for the normal cycle.
Posted on Jan 18, 2009
Possible solution would be to push the reset button if you haven't already. I have had to do it twice on my dc90 in the last week.
If you look at the glass where you can see the combustion chamber, the glass is oval, follow the long axis of the oval toward the 'top' of the ignition chamber (my unit is laying down, with the blower on the west end and the combustion chamber on the east, as I am facing south). On top of the chamber are two protected spade clips. In between them is the reset. Make sure that the unit is off, press the button, and fire it back up.
Posted on Feb 20, 2009
Sounds like the flame sensor is dirty or bad. This sits in the burner flame when the burners are running. This usually has a single white wire connected to the back of it.
Posted on Jan 03, 2010
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