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The led indicator blinks 3 times on an Amana 90 furnace. What does this mean? The furnace won't fire.

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Pressure switch open. Remove the small hose at the blower assy and gently **** on it. You should hear the switch on the other end of that hose change states. If not then it's the hose (cheap) or the switch (100 bucks but tough to find 2 years ago) or the wiring to/from or the control module. If it does do you have a bunch of white **** (the gasket) coming out of the black blower mount? I had to remove broken gasket and Permatex the seal to create the proper pressure; that's probably your problem as well.

Posted on Oct 03, 2008

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Rheem Classic 90 FURNACE. Blower motor constantly running, even if t-stat is removed. Led blinks four times. PS closed, is the code. Not a psycho problem, I think it is the voltage transformer.


An LED that blinks four times followed by a two-second pause is signaling the pressure switch is closed when it should be open. The switch itself might be stuck, or the tubing that attaches the switch to the furnace's draft inducer might be blocked

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Each color will also flash a specific number of times to signify a specific error. ... 4 redcolored flashes may be signaling that the "high-limit" switch might be open. ... 3 green colored flashes on your furnace has the same meaning as 2 green colored flashes. ....If a system problem occurs, a blinking LED shows a fault code.Missing: xenon

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Bryant furnace plus 90 led code is blinking once then 3 times fast. What does it mean?


these codes are on the inside panel of the front cover of the furnace. lift off and look inside.there should be a code explain chart on the panel by the light. this panel will need to be replace correctly for the furnace to work as there is a door switch.

Jan 31, 2011 | Heating & Cooling

1 Answer

I have an amana dms 90904cms furnace ..the fan runs but no heat. I opened cover and saw the red led blinking 3 times code says open pressure switch. what does that mean?


Open pressure switch is when your vent motor comes on it has to get a certain vacuum pressure or it won't ignite furnace. There should be some little black hoses connected to vent motor and maybe into heat exchanger, running to these pressure switches. Pull hose off one end and make sure hoses are not kinked or some times if hoses have sag in them they can fill with water. Other causes are if venting is obstructed or pressure switch is defective, especially if it got moisture in it.

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1 Answer

On a 80% Rheem upflow furnace... The AC works fine but when switched to heat nothing happens. "OK" LED is on solid, second LED is blinking 3 times, "FLAME" LED is not on at all. What can be the problem?


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Aug 10, 2010 | Heating & Cooling

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I have an Amana Air Comand Gas furnace/AC, it's 4


Hi, If you are talking about an led light at the furnace, and it is blank, it should have a 3 to 5 amp fuse that plugs into the board. Pull it and check to see if the metal element is blown or burnt. If so, replace it. If you are talking about some other red light, please let me know. It sounds as though you have lost the 24 volt control voltage, so see if it has a fuse on the board. Keep me posted.
Shastalaker7

Dec 31, 2009 | Heating & Cooling

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Induced Draft Blower Not Blowing- 3 Blinks on LED


Your doing well just right. When the call for heat is on the draft motor gets a call from the board to come on. When this happens if no voltage is present at the motor then you ahve abad baord. Replace it.

Nov 28, 2009 | Heating & Cooling

1 Answer

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2 Answers

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