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I have a Goodman gmt070-3a furnace. It is not igniting to

Customer Question
blow hot air. The gas...
I have a Goodman gmt070-3a furnace. It is not igniting to blow hot air. The gas is on in the house but the igniter never glows. I've replaced the igniter with 2 different igniters and still no luck. What else could it be?
Submitted: 2 years ago.Category: HVAC
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Answered in 6 minutes by:
11/16/2015
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 15,849
Experience: 20yrs in the HVAC industry with certificates and degrees.
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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a significant delay in responses. Please be patient and often I will ask you questions to narrow down the issue to get is diagnosed correctly.

Have you checked the rollout thermostats around the burner area. One of them could be tripped open causing this issue. Some have a reset button on them and others do not. They all have to be closed in order for it to work properly. Start there and let me know what you find.

They would look like this

CLICK HERE

We are on the honor system for our time, all I ask is please rate my service using the STAR RATING LINK on your page before you leave. If you are not happy with the service please let me know before leaving a negative rating. This is the only way I am paid or credited through the site for my time. This will also allow you to get directly back to me for FREE follow up questions and tips are greatly appreciated! Thanks

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Customer reply replied 2 years ago
I don't see one. Can I text you a pic?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Yes

CLICK HERE'

Or this one

CLICK HERE

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HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

You can upload a pic here with the paperclip attachment

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Customer reply replied 2 years ago
I think the 2nd one you have up there may be it. There are two of them in there
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Yes press on the button in the middle and see if one clicks, then try it. Let me know

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HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Those two right in the front with the blue reset buttons.

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Customer reply replied 2 years ago
Ok they dont seem to depress but tried it. Still not working. Ignitor never glows
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Ok does the exhaust blower come on and run?

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Customer reply replied 2 years ago
Kicks on, blows for about 30 secs, which used to be when the ignitor would glow then ignition.
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

OK have you tested for power at the ignitor leads?

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HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Also are you getting any error codes on the board?

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Customer reply replied 2 years ago
I have not tested the leads. Do you mean those on the harness going to the ignitor? Also, how do I know if there's an error on the board?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Yes the leads to the ignitor check them for power. You should have a flashing error message on the board leds.

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Customer reply replied 2 years ago
I have a fluke 75 multimeter but not sure what setting to test the leads??
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Set it to AC VOLTS 200 range and put it across the two leads to the ignitor and start it up ...after the inducer comes on what does it read?

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Customer reply replied 2 years ago
ok so just connect to the leads and start the furnace?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

YEs put your meter leads across the two to the ignitor and start it up see what you get on the meter

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Customer reply replied 2 years ago
65
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Ok well that is like half power so you may have a board relay issue it sounds like it. Do you get nothing then it goes to 65 ?

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Customer reply replied 2 years ago
nothing flashing on the board
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

OK if nothing is flashing on the board at all and you only have 65 volts to the ignitor I would say the board is bad. Can you remove the board and check the backside for any burn marks?

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Customer reply replied 2 years ago
now the red status light comes on as usual, the blower kicks on, I hear the click like the ignitor should come on but it doesn't. Would all of that still occur if the board was bad?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

The joint on the relay for the ignitor may be bad, the relay for the ignitor is on the board though

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Customer reply replied 2 years ago
Ok. So what do I do next?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

I would check the backside of the board where the relay for the ignitor is, see if one of the solder joints is bad. Or replace the board on the unit.

We are on the honor system for our time, all I ask is please rate my service using the STAR RATING LINK on your page before you leave. If you are not happy with the service please let me know before leaving a negative rating. This is the only way I am paid or credited through the site for my time. This will also allow you to get directly back to me for FREE follow up questions and tips are greatly appreciated! Thanks

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Customer reply replied 2 years ago
could it be the flame sensor?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Not if the ignitor never glows

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Customer reply replied 2 years ago
ok. how about the harness from the board to igniter harness? do those ever go bad?
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

It could, you should then check for power right off the board to the ignitor to see if you have 120 if so then maybe a wire issue.

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HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

A couple joints look overheated....but nothing else. Can you check power off the board to the ignitor to confirm you are not receiving correct voltage?

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Customer reply replied 2 years ago
Sure. Although I'm not sure how to really
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Do you see the ignitor wires that go to the board?

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Customer reply replied 2 years ago
if the joint on the relay is bad then the whole board needs replaced?
Customer reply replied 2 years ago
Now it won't kick on at all. Not sure why....the red light on board is on but unit doesn't kick on
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

I think there is an issue with that board for sure, nothing else really would cause that issue.

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Customer reply replied 2 years ago
I've now replaced the ignitor and the board and the ignitor still does not glow during the process to kick the unit on. What other suggestions do you have? I'm $200 in parts at this point. Thanks
HVAC Technician: HVAC Guru, HVAC TECH replied 2 years ago

Does the inducer fan come on and run?

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