Question about Heating & Cooling
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: my furnace is flashing 21
not sure what 21 is ,but if you are getting acode normally the code comments are on the door or the manufacture lable to tell you what they are...
i can tell you the operation and maybe that will help you out...
the unit should start off with the enducer draft motor small motor in furnace that pulls all the stale air out..then the negative pressure switch activates which should have a hose coming from the enducer draft moto to the pressure switch..once the pressure switch closes it sends power to the ignitor and the ignitor should glow once it gets hot a milivolt current is sent back to the gas valve and it opens up and fires...after it fires you should have a flame sensor small metal rod in the direct path of flame that keep sensing the flame and sends signal back to board.... unplug unit and watch it start where is it failing or in what part of the operation does it flash a code....
Posted on Jan 03, 2011
Hi, is there 3 blinks followed by a 2 second pause? if so then you have a open limit switch on the furnace, a limit switch opens when the heat exchanger gets too hot. If you have a meter check the continuity through the limit switch if its closed you should read resistance if it's open the meter will read OL.
Posted on Jan 16, 2011
SOURCE: i need a list of
LED Flash list should be located on the inside of the unit's electrical panel by the wiring schematic, and by counting the flashes in between the longer pauses should give you the diagnostic code. A continuous steady flash can also mean normal operation, and something else on the inside could be holding you out like a float switch tripped (located on emergency pan underneath Air Handler Unit If Applicable) etc.
Posted on Jul 05, 2011
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