Goodman gds80703 turns on and off intermittendly 3 light blinks
My goodman furnace sometimes turns on and immediately works, other but alot of the time i flip the main power switch off and turn the thermostat all the way down then back up and flip the switch back on and it does nothing. its really cold in my house as i live in michigan and i dont know what to do. it is odd when i turn it on, the fan kicks on, and the board clicks, the pilot glows, then the board clicks again then the pilot goes dark and the fan just turns on. like i said it works intermittently and i dont know what the problem is. someone please help and if i need a part please tell me where it can be located. im desperate
Re: goodman gds80703 turns on and off intermittendly 3...
Have you check to see if the direct drive motor comes on. (The big one on the bottom of the unit). Turn your thermostat up and then go down to the unit shut off the switch attached to the unit and turn back on. See if the start sequence works. (small motor starts to spin,(top of unit), the flame sensor comes on, and the gas ignites. Once the unit has warmed up enough the main motor on the bottom should start to turn and blow warm air into the vents. If the motor does not turn on, the limit switch cuts on and turns off the gas flow. I replaced the main motor myself and my furnance has worked fine ever since.
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Re: goodman gds80703 turns on and off intermittendly 3...
There will be a diagnostic code that will blink on the control board. Look thru the clear window at the control board after the unit does not light up. On the reverse of the front panel, you will find a wiring diagram and in that area there will be a diagnostic code table. Sounds like a bad gas valve.
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Need your model # to check the codes but, this coming back on after turning the t-stat off is rare. You may have been in a lockout and the furnace re-started. Some furnaces try to start three times , then lock out. Time out, then re-start. The codes should be on your furnace blower door. Write back with this info and i could help.
Check your furnace by the electrical panel, there should be a blinking error light. Sometimes there is a legend to how many blinking lights means what. I had an issue with mine, read the code and it turns out it was hitting the high heat limit. Turns out my blower motor wasn't turning on. Replaced it with a spare and it was fixed. Find out what type of furnace, and google the name, model, and the words, 3 blinking lights. Does your furnace turn on at all? Does it start to go through the cycle then stop? This is the proper cycle of a furnace and what should happen.
Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.
This indicates a open limit switch on the furnace, the heat exchanger is getting to hot therefore the limit switch is opening and not allowing the furnace to work properly. Did the techinician check the limit switch on the unit?
had similar problems with same furnace. I think the 3 blinks is high limit event. either way with the power off to the furnace remove the board from the 4 clips holding it on one at a time then turn it over and look at it you will be able to tell if the board is bad because it will appear scortched and the resin will be bubbled up where it went bad. replace board and you will be fine. went through 2 in 2 years all of a sudden they are being made by a different company from the original and the 1st replacement. now all is fine. Take a good picture of the board close up so you can reconnect all the wires properly. Friend of mine got it from a wholesaler for $55.00
double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again
The blink codes are differant on every furnace. Read your code on the schematic found on the inside of the door. You most likey have a dirty flame sensor. Under the burners you should find a "single" wire going to a connector. This will be to the far left or right. Just opposite of a "two" white wires going to the hot surface igniter. Remove the 1/4 inch screw closet to the single wire under the burner. carefully pull out the flame sensor. Clean it with a small piece of sandpaper. Re install it. This should fix your furnace. KEEP IN MIND Goodman GMP models are noted for defective heatexchangers. Pull out the blower assembly and turn it over. If small rings about the size of a dime falls out.... this furnace is unsafe and should replaced!
Make sure the inducer motor is free of condensation and that all water is able to drain out. Unfortunately your furnace is a lower-grade “builders” model and does not have the same quality of components and workmanship as a Carrier or American Standard furnace. Prior to these failures, It was about 1/2 the price of the units mentioned. And the warranty drops off quickly. You get what you pay for. Contact Goodman to see if they will cover the cost of your parts at 1-877-254-4729 US only. Their own motto is “Quality Makes the Difference”. It sure does.