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Furnace not working. ok light flashing - Air Conditioners

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I take it we are talking a furnace/blower with a burner and compressor located else where?

22yooper is correct on the 'brain" in many units as described above, the flashing light will indicate a code, however I have a White Rodgers, which I did a Frankenstein number on to get my furnace working, and the green light is "normal when flashing", and the instructions on time between flashes for a code are there, but very hard to determine.

But 22yooper is exactly correct on I would say a majority of stand alone blower units with "A": coil, burner, and separate compressor.

We are talking a furnace, not an air conditioner, which produces only cool air?


Posted on Dec 02, 2008

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The flashing light indicates that there is a problem. Turn off the power and then back on. Count the flashes and it will indicate the code to the problem. There will be a time pause between the flash codes. The most common problem is the failure of the hot surface igniter .

Posted on Dec 02, 2008

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Rheem Model RGPS-12EARJR just purchased in Sept and now the furnace won't turn on. Can't find if there is a pilot light I should be starting, but even the fan doesn't go on - with or without heat

Newer, high efficiency furnaces have solid state controls and NO pilot light.
To light the gas the new furnaces use a ceramic heating element rather than a pilot light.
If the furnace isn't turning on you'll need to get a service tech to look at it for you. The circuit board has built-in diagnostics. Your furnace may have a window that lets you see the diagnostic light inside the blower box. Turn off the light in your furnace room to make it easier to see the flashing LED. See what pattern the light is flashing and look it up in your owners manual.
It's usually something simple, like no power (the light doesn't flash at all, obviously), or too much back-pressure on the exhaust line, or a faulty temperature sensor or faulty ceramic element.
I can't tell how you're trying to turn on the fan, but it could be as simple as a blown fuse or tripped circuit breaker.
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1 Answer

Model G5RA096C-16 motherboard light flashes one time pauses then flashes again and so on. The furnace turns on and blower turns on but does not heat. What does the flashing light mean?

Your furnace is off on a safety limit. Look for small thermal disks around the burner area they will have a usually red switch in the center and 2 wires coming into it. Reset this and watch furnace run. These are called rollout switches and they trip when you have flame rollout. SO WATCH IT RUN. If you have flame rollout you will most likely have a cracked heat exchanger if so you will need a new heat exchanger or new furnace. Next the number of flashes is important on some furnaces it will tell you what part is faulty. Count the flashes then on one of the furnace covers is the wiring diagram it will tell you what the flashes mean otherwise you can tell me and Ill help you out, WHen you reset the power on the furnace does it try to heat tell me what all happens when you shut the switch off then back on. when you turnit back on make sure the stat is calling for heat,

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Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

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Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

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The flashing light may be a diagnostic light. So count the sequence of flashing lights and write the number down like this example. Short(flash),Short(flash), Long(flash) Long(flash), Long(flash.

Usually on the other side of the blower compartment door there is a list of possible failures that will coincide with the number of flashes.

My guess is that the system is low on refrigerant. This has caused ice to form on the evaporator coil that is above the furnace. The ice will block the air from moving through it.

You will need an EPA certified technician to recharge the system and locate the leak. Make sure to shut off the A/C and allow it to thaw before he/she arrives to services it.

There are other possibilities but this one is probably the most common. Good Luck!

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