Ask Experts Questions for FREE Help !
Ask
    jamaica902's Avatar
    jamaica902 Posts: 3, Reputation: 1
    New Member
     
    #1

    Feb 12, 2007, 04:17 PM
    Goodman furnace GMNT080-4 furnace runs good for a while then has to be manually reset
    I have a Goodman GMNT080-4 (90%). I'm having the same problem
    As Streatherg did back in the Nov 2006 question. I reviewed his article and tried
    Every thing on there but seems to be doing the same thing.
    The furnace kicks on for about an hour then locks out and has to be manually reset threw the thermostat or the power switch. The led light blinks 1 time and it says it could be
    1. flame sensor 2. gas pressure 3. gas valve . I cleaned the flame sensor , checked the gas pressure but don't understand why the gas valve would fail if it runs fine for a while when first starting.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
     
    #2

    Feb 12, 2007, 04:24 PM
    If you have read the code right, this is one of those things that drive service men nuts. A part is probably failing, you will have to be observing the problem as it happens, or more likely the problem will worsen and present itself.
    jamaica902's Avatar
    jamaica902 Posts: 3, Reputation: 1
    New Member
     
    #3

    Feb 13, 2007, 06:28 AM
    This problem has been going on since the beginning of the season, and I've had service
    Guys just come clean the flame sense and check gas pressure, but they tell me the gas valve seems to be doing it's job. Would you recommend me getting gas valve changed? Or
    Do you think it might be something else like the circuit board? I was curious if you ever heard back from Streatherg from the Nov question? I'm having the same problem as him and just wondering if he ever got his operating normal? Thanks in advance!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #4

    Feb 13, 2007, 10:38 PM
    The gas valve could overheat/defective. You can test to see if it is the problem by taking a meter ad place the leads on the valve. When the valve is operating normally you will have 24 volts to the valve. If the valve drops out with the power still applied then you know it is the valve. If the power drops to the valve causing the furnace to shut down then you know it is not the valve. We use electric recorders/event recorders to check this out. It beats standing at the furnace waiting for it to fail. One of the first things I teach my students is how to save time and the event recorder does that very well. I
    jamaica902's Avatar
    jamaica902 Posts: 3, Reputation: 1
    New Member
     
    #5

    Feb 14, 2007, 05:40 AM
    Thanks, I'm going to check that as it fails to see if I can catch 24v at gas valve before it
    Goes in to lock out mode. I appreciate all the help! Thanks again.
    HVACtech45504's Avatar
    HVACtech45504 Posts: 5, Reputation: 1
    New Member
     
    #6

    Jan 28, 2010, 12:46 PM

    The problem is the stack over temp sensor located on the front of the fume exaust fan. The stack over temp sensor is prematurely tripping thus dropping the 24v to gas valve. The unit tries to re-light 3 times and after 3 failed attemps the circuit board goes into fault mode with the flash code of 1. This is the code for ignition falure. When this occurs the power to the furnace must be cycled to return to service. You can test if the stack sensor is bad by bypassing it. If the furnace runs normally then you know it's the stack over temp sensor. P/N B1370254 for the GMNT080-4.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Wiring a furnace thermostat to manually operate the furnace fan [ 2 Answers ]

I have two wires connected to my furnace thermostat. There is a place labeled G on the thermostat. Can I simply run a wire from the G terminal on my thermostat to the terminal labeled G on my furnace fan relay to operate the fan separately?

Goodman Furnace [ 2 Answers ]

How old is my Goodman furnace and how efficient is it? Model GUEQ80-4REVS Serial #910482720

Gas Furnace needs reset button pushed to work [ 1 Answers ]

1983 - Natural Gas - Rheem Furnace Model #RCDA-100C-ER Originally the furnace blower would not come on. I called a technician who pushed a reset button. He mentioned something about the air fuel mixture and that a gust of wind could have tripped the furnace off. Pushing the button worked for...

My Furnace won't kick on even after I've manually primed it 10 times [ 1 Answers ]

I need to know why I can't seem to keep the furnace running I prime it it stays on for 2 minutes then shuts down even before the blower starts . What's up with the red light near the reset button

Must reset furnace breaker to activate [ 3 Answers ]

I installed a ritetemp digital thermostat and appear to have 2 problems. 1) I’m not getting any ac to the thermostat, so it does not activate the furnace. I know I need to check the 24v transformer and common per the other threads. But, if I go to the circuit breaker panel and reset the furnace (80...


View more questions Search