Question about American Standard Heating & Cooling
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
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Posted on Jan 02, 2017
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