Question about Heating & Cooling
It's a day & night furnace, model #N8MSL/N8MSN PS 80. it's blowing Hot Air fine, but the LED light will not flashing?
A steady heartbeat on the circuit board USUALLY means normal operating condition.
Posted on Mar 29, 2015
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Posted on Jan 02, 2017
SOURCE: furnace not blowing air
this may sound not useful but the first thing to try is turn off the breaker or fuse to the feed for the furnace for 1 minute and turn back on and listen and note exactly what it does from there and will have better idea how to help and this might fix the problem try and let me know th results
Posted on Jan 01, 2009
If you know where the high limit switch is you can always cut the two wires and wire them together causing the limit to close. But what you have to watch out for is why the high limit is not closing. That means in your return air either you have a dirty return air duct, dirty filter, or you don't have all your registors open to allow the heat to escape the heat exchanger. Just watch over riding the system. The high limit switch should either be on or behind the blower, in the middle of the system right under the heat exchanger. any other questions about hvac just ask.
Posted on Jan 17, 2009
ok this is going to sound funny but it seems as though the polarity is reversed going into your furnance. to correct this proiblem you first need to unplug the unit and where the cord goes into the furnance at that connection disconnect the two wires. Once theses are disconnected switch the wires .All you are doing is reversing the way the electricity flows into the circut board. I would wager that is the problem
Posted on Apr 16, 2009
That blinking light may be the diagnostic light. Count the blinks next time it fails. Carrier units will have two different blinks depicting the error code such as one blink followed by a pause than 3 blinks giving you an error code of 13. Then look at the wiring diagram, it will have an error code chart telling you where to start with your diagnosis. You already know that if you remove the cover it erases the error code, so look thru the small window first.
Posted on Dec 01, 2009
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