cant figure out the problem

 
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Old 03-08-2013, 09:16 PM   #1
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cant figure out the problem


Im still a student and in my house i got a goodman 80% furnace.When i set my thermostat to 70F the furnace works just fine.If i turn it of for one night the house gets to 65F when i turn it back on the furnace turns on normal operation but after a while the burners turn off and the blower motor runs still but then all the sudden the inducer tries to start again because the thermostat is still not satisfy and tries to turn on i change the thermostat already but it didnt make no difference in my opinion i believe my corcuit board is going bad

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Old 03-09-2013, 04:37 AM   #2
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Re: cant figure out the problem


Use your multimeter and see if the inducer is getting 120 volts when it tries to restart.
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Old 03-09-2013, 06:36 PM   #3
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Re: cant figure out the problem


It does
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Old 03-09-2013, 06:46 PM   #4
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Re: cant figure out the problem


If its getting a constant 120 volts when it tries to restart, its not the control board that is the problem. Sounds like the inducer over heat when it has to do a long run to go from 65 to 70.
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Old 03-10-2013, 01:55 PM   #5
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Re: cant figure out the problem


But what i see is that the hot surface igniter glows too while it does that
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Old 03-10-2013, 03:11 PM   #6
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Re: cant figure out the problem


Quote:
Originally Posted by manny View Post
But what i see is that the hot surface igniter glows too while it does that
If the inducer isn't starting nd the HSI still glows. You have a bad board.

In order for you to receive good help over the internet. You have to tell us all of the symptoms, not just a few.
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Old 03-11-2013, 02:35 PM   #7
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Re: cant figure out the problem


Dirty flame sensor...
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Old 03-11-2013, 07:27 PM   #8
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Re: cant figure out the problem


Heres a example i turn off the furnace for a night and when i woke up the house temperature was at 65F i called for heat and put the thermostat to 70F when it reach to 66 the burners turn off but the thermostat was satisfy so while the blower motor was moving the rest of the air the inducer turned on and it the HSI glowed but then it went off and again it did the same thing and in the board it just says reset for one blink and thats what it does one blink in the circuit board theres glue all over it and the thermostat is new i cleaned the furnace im my believe i think its the circuit board
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Old 03-11-2013, 07:29 PM   #9
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Re: cant figure out the problem


I it a GMP? May be a bad heat exchanger.
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Old 03-12-2013, 08:01 AM   #10
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Re: cant figure out the problem


How can it be the heat exchanger
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Old 03-12-2013, 05:07 PM   #11
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Re: cant figure out the problem


On a GMP, if some of the crimp rings have popped. As the heat exchanger gets hot, it separates at the rings and allows air to blow into the heat exchanger. This can cause the flame to move a way from the flame sensor, or for the inducer not to be able to keep enough negative draft to keep the pressure switch closed, and on some for the flames to roll out and trip the roll out switch.

So if you have a GMP, inspect the heat exchanger for popped crimp rings.
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Old 03-13-2013, 01:59 PM   #12
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Re: cant figure out the problem


You will need to check the LED on the circuit board in the furnace. When the furnace shuts down it will blink a code indicating why it shut down. In most cases, 80%furnaces only have problems with the pressure switch and an occasional roll out switch problem, however there are other possible causes, including problems with ductwork restrictions.

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Old 03-25-2013, 05:35 PM   #13
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Re: cant figure out the problem


I would check all my connections, to make sure they are right. Use your meter to check your readings. Also check your circuit board.
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Old 03-25-2013, 06:40 PM   #14
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Re: cant figure out the problem


I figure out it was the circuit noard whwn i took it out it was burn from the back thank you everyone for your comments and help
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Old 03-25-2013, 06:50 PM   #15
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Re: cant figure out the problem


Did you check for popped crimp rings yet. no use getting anew board if the crimp rings are popped.
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Old 03-28-2013, 12:26 PM   #16
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Re: cant figure out the problem


clean the burners, clean the heat exchanger and flue, Flame sensor... maybe your pressure switch is turning the unit off?
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