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Furnace piolot on, gas on, turned thermastat on and furnace is humming did not start up.

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Fanmotor is bad, change it out, thank you very much!

Posted on Sep 13, 2008

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My heil n9mp2 isnt working just hums


is the flame igniting and then cutting off? on a gas furnace, the induction fan motor(draft motor) should start first (if the furnace is so equipped), then the flame, then the blower. if you have an induction motor (flue gas exhaust mmotor) this may be your problem (the induction motor isn't starting), if your unit doesn't have one, have you checked to see that you have gas? finally, the capacitor on the blower motor may be causing the motor not to start.

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Have you checked the capacitor? Try spinning the blower wheel by hand, if this gets the motor going you have a bad capacitor. If not, the motor will need to be replaced.

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Burner and piolot light keeps going out


Hi,

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101



...........

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When the thermastat turns on the furnace doesn't ignite the burners and the pilot light is lit. Everything appears to be normal, fan runs, thermastat appears to work properly.


You may have an open limit or a bad gas valve. Check and see if you get 24 volts to the gas valve, if you do then you gas valve has gone out.

Oct 06, 2010 | Air Conditioners

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Goodman U-30 Furnace


observe the sequence of operation. stat calls for heat and sends a signal, to furnace. check for 24 volts to common and white wire at furnace.first the forced draft motor starts and should have 120 volts to the plug it attaches to. after forced draft motor starts the pressure or vacuum switch closes should show no 24 volt when checked across terminals. shortly after the ignitor glows and shortly after click the main gas valve opens and main burners fire. shortly after the indoor fan comes on and hot air blows into the ductwork. follow the chain of events to see what doesnt happen and it is a clue to whats broke. maybe start by switching fan switch on stat to on. if fan comes on you have high and low voltage thereby eliminating the stat power and transformer as a problem. if you can see the ignitor look for it to be cracked . look close dont touch any part of it .it is powered by 120 volts when energized from board. dont forget when you take the door off there is no power to the furnace so be prepared to tape the safety switch closed when you are diagnosing.

Oct 24, 2008 | Air Conditioners

1 Answer

My ventless gas heater has an uneven flame with orange tips, the flame toward the outer edge is higher than the flame in the middle, and also,when I light the heater, it doesn't just give me a piolot...


This sounds like your gas valve is weak. An orange flame has to much gas and not enough air mixture. Have you trie to ajust the air mixture. If it won't ajust then you will need to replace the valve.

I hope this helps.

Oct 24, 2008 | Air Conditioners

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