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Heat unit not blowing hot

I have an electric unit that is just blowing warm air. I checked the elements they seem ok but when I touch the outside of the box the top two are cold and the bottom one is just warm.

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Chances are the thermal fuse has blown on the two elements. This is very common on electric furnaces.
There may also be a reset-able temperature sensor.

Turn of the power and access the electrical connections of the heater elements. First, look for burned connections to any of the components, all the way back to and including the sequencer relays. It's very common for these to burn as well.

If all looks OK, then look for a round button about the size of a quarter on each of the elements. If there is a red button on top, press it, then test to see if all the elements heat up. If they don't, or there is not a reset button, then it's probably the thermal fuse, a little silver bullet shaped piece about 1/2 inch long, and 1/8 inch in diameter. Usually you must remove the burner from the heater casing by disconnecting the wires, removing the two screws, and sliding the element frame out.

The final problem can be one or both of the elements has broken, or one has broken, and the other has a blown thermal fuse.

It could also be blown power fuses which provide power for those particular elements. Check all the larger diameter fuses, and if any are bad, look deeper for the cause of the fuse failure. REPLACE WITH ONLY FUSES OF THE SAME RATING!

The sequencers have a habit of failing as well, and are harder to test. If all the above checks out OK, then replace the sequencers.

Please reply if you have additional questions. Please include the make and model of furnace as well.

Posted on Jan 16, 2009

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