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GOODMAN CMA80905CXBA FURNACE. INDUCTION BLOWER NOT ENERGIZING. GETTING 3 "BLINKS" FROM DIAGNOSTIC LIGHT (LOW PRESSURE SWITCH OPEN). THE A/C WORKS & THE BLOWER FAN COMES ON WHEN THE STAT IS IN THE HEAT MODE WITH THE FAN SWITCH ON. WHILE THE FAN IS ON , THE DIAGNOSTIC LED STILL BLINKS A CODE OF 3. THIS IS NOT A CONDENSING FURNACE. I BYPASSED THE STAT (W & R)TWISTED TOGETHER---SAME RESULT---DIAG LED COMES ON STEADY, THEN FOUR CLICKS, AND BACK TO THE CODE OF 3 BLINKS. CIRCUIT BOARD???? OR 120VAC NOT


Answers :

The pressure switch is closed before the draft motor closes it.the board is telling you that this is not right.pull the wire(either) off of the pressure switch to see if furnace tries to light.if it does,you should replace the pressure switch.

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GOODMAN CMA80905CXBA FURNACE. INDUCTION BLOWER NOT ENERGIZING. GETTING 3 "BLINKS" FROM DIAGNOSTIC LIGHT (LOW PRESSURE SWITCH OPEN). THE A/C WORKS & THE BLOWER FAN COMES ON WHEN THE STAT IS IN THE HEAT MODE WITH THE FAN SWITCH ON. WHILE THE FAN IS ON , THE DIAGNOSTIC LED STILL BLINKS A CODE OF 3. THIS IS NOT A CONDENSING FURNACE. I BYPASSED THE STAT (W & R)TWISTED TOGETHER---SAME RESULT---DIAG LED COMES ON STEADY, THEN FOUR CLICKS, AND BACK TO THE CODE OF 3 BLINKS. CIRCUIT BOARD???? OR 120VAC NOT


The pressure switch is closed before the draft motor closes it.the board is telling you that this is not right.pull the wire(either) off of the pressure switch to see if furnace tries to light.if it does,you should replace the pressure switch. ... Goodman Air Conditioners

I have a furnace 90+ . I have no power at the t-stat..no led, blank screen, and the blower will come on. The furnace is tied into a control panel. I can jumper the the unit at the furnace to have the A/C to come on. It will go thru shut down cycle and stop. 5 min. later the blower comes on.I've cut power to see if it will reset the board, no change in operation. control board has 24 volts with status light on but other lights off. All limit switches closed. I,m in need of sugestions Thanks.


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I'm not sure what the problem may be but you could try calling All\015\012Seasons RV Appliance Parts & Service. There number is\015\0121-800-344-0673 they have helped me in the past. That and there tech\015\012calls are free so it wouldn't hurt ... Dometic Rooftop RV Air Conditioner

When I set tstat to call for a/c, compressor outside comes on. Blower on furnace does not. When I manually rotate fan limit switch on furnace wall, blower comes on, blows cold air, and then goes off when I release the fan limit switch. I have a Honeywell 83251008a low and high voltage transformer, and Honeywell (I think) limit on off switch. I also noticed the 2 wires coming from the Honeywell Gas regulator are off. They were connected at the onset of the problem. I am not sure where to re


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I have a Coleman Presidential 7670 furnace in a mobile home. customer said it came on a couple of times by itself. I ran new wire, fan won,t shut off. Replaced fan switch, fan still won't shut off. Replaced t-stat, same problem. This is an older unit and has no board it has a fan switch a low limit switch, i,m guessing the other is a high limit and a fan relay. I have no schematic and am very frustrated can anyone help me please. Thanks. Brian from california


Brian, it sounds as if possibly the fan relay is stuck however, if the fan will not shut off I would suggest the following, Follow the wires from the fan to the relay on the relay disconnect the fan wire there and see if the fan shuts down if so t ... Air Conditioners

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Heat does not come on. Furnace light blinks 3 times, indicating faulty pressure switch. I jumped the pressure switch, which caused the ignition filament to light up. However, it quickly shut off again. No gas comes out so the blower never starts up. Have checked the lines, they appear to be clear. Furnace is only about 6 years old. Any idea what is causing this and how to fix it?


Hi,When jumpering the pressure switch ...you need to let the blower start and then apply the jumper... the brain needs to see the proper sequence or it will not allow the gas valve to open...and when it shuts down the jumper must come off ... Air Conditioners

Coleman mobile home furnace Model #7966-756 will not turn on. The pilot light is lit, there is power coming to the step-down transformer inside the furnace. The reset switch is in the right position. It worked fine when i turned it off last spring, just wont start back up now. The blower fan will not even come on when i switch it from the auto position to the on position on the thermostat. Any ideas?


I had a similier problem, Check your neutral ground? also alot of power companies will come out and do a basic check of the voltages going to the furnace, and can offer advice for free. ... Coleman Air Conditioners

Rooftop air, when stat calls for cooling, fan comes on but no compressor. If I switch the stat of & on a couple of time manually, the fan and compressor both come on. Does this sound like the start relay going bad?


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Furnace stopped blowing cold. 'Stat works, blower works. Went outside, condensing unit fan does not run, motor is excessively hot to the touch. Fan blades spin freely. I pulled the disconnect and switched the stat to fan on / no cooling for now but it's 94 degrees today... HELP! :-)


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The control board seems to be detecting reverse polarity, and my first thought is that the relay contactors are oxidized, but you could also have a bad startup capacitor, and/or control board.\015\012The only reason I say control board is becau ... Air Conditioners

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Hi,How many times that light is blinking?Is it 3 times sequence?Let me know,so that we could proceed.Thanks!! ... Air Conditioners

Sanyo Condensing unit. blower fan doesnt come on unless unit runs,but unit only runs for about one minute and shuts off. led #6on cond. unit blinks and led on evap. coil #26 also blinks unit needs to be turned offon for it to restart.


First, the condensor fan is only supposed to run when the unit is on. As for the one minute run, then needing reset...this sounds like a "safety out". The air conditioner knows something is wrong and tries to protect itself. Being low on Freon wou ... Sanyo Air Conditioners

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