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My gas furnace is working but the led light will not stop flashing, is it suppose to keep flashing.

It's a day & night furnace, model #N8MSL/N8MSN PS 80. it's blowing Hot Air fine, but the LED light will not flashing?

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  • Expert
  • 484 Answers

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

muttandjeff
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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

  • 5 Answers

SOURCE: High limit switch open on armstrong furnace

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.

David

Posted on Jan 17, 2009

  • 534 Answers

SOURCE: Furnace blows cold air, ignitor won't glow.

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

Therinnaiguy
  • 1420 Answers

SOURCE: Carrier Gas Furnace runs fine randomly stops blowing LEDs flash

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

  • 1214 Answers

SOURCE: it keeps turning off but the green led light goes

Please provide a manufacturer name and model number.

Posted on Dec 14, 2009

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House heater does not blow hot all the time. the furnace kicks on and then shuts of and then the blower just blows cold air. the furnace tries to kick on three times but shuts off, sometimes it works just...


When it blows cold air, there should be an error code blinking on the LED light located on the PC board. Look through a small viewing port in the front panel, then remove the front panel and on the reverse side there should be a diagnostic code chart to help you figure what is wrong.

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Feb 15, 2010 | Heating & Cooling

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My furnace is not blowing hot air when I turn on


Hi,
Normally if you have a limit switch problem on a hot air furnace it is the manual high limit switch that should be located near the blower. If you lost power while the unit was operating the heat build up will trip this switch.
Normally they are about 2 inches round with a red button in the center. Firmly push the button till it clicks.
Sometimes it can be the high limit switch that is just a saftey switch in case the furnace gets too hot.
If you do not have enough air flow this switch will operate excessively and will eventually fail.
The best way to find the problem is to trace the low voltage control circuit till you find the open switch. This can be challenging and time consuming, especially if you are not used to doing it.

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

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Day / Night HVAC is running cool air BUT the furnace is running 2


Strange. Does the thermostat control both the air conditioning units and the furnace. If not make sure the furnace thermostat is turned down to below 65 degrees.

Jun 29, 2009 | Honeywell Programmable Thermostat Heater

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My day&night heater just started to blow air and no heat,


Count the flashes on the circuit board. Check the diagnostic codes listed on the inside of the doors next to the wiring schematic. This code should narrow down the problem. The most common problem on a gas furnace would be either a dirty flame sensor or a bad hot surface ignitor.

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To fix this issue you must drain the water/condensation from the small 5/16th hoses in front of the blower assembly , just pull them loose and angle them downward to drain. This should fix the problem if this is the problem.
Let me know how it turns out or if you have anymore questions. Phil

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