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My furnace won't Ignite. The ignitor glows. It doesn't seem…

Customer Question
Hey. My furnace won't...
Hey. My furnace won't Ignite. The ignitor glows. It doesn't seem to be getting gad
Submitted: 2 years ago.Category: HVAC
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Answered in 3 minutes by:
2/5/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,542
Experience: Furnace, A/C and heat pump specialist.
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Sounds like you either have a gas pressure issue if igniter is lighting . Do you have a manometer or gas pressure gauge that reads pressure in inches of water column.?

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Customer reply replied 2 years ago
No I dont
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Do you have other gas appliances that are working properly?

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Customer reply replied 2 years ago
Unless that is on the inlet to the home.
Customer reply replied 2 years ago
We do have a gas stove which is operational
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

1. Do you have a meter to verify we are getting 24v to valve when igniter lights?

2.Do you hear the valve click?

3.Do you smell any gas at all?

4. LP or Natural gas?

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Customer reply replied 2 years ago
Natural gas. I don't smell any. There was a faint smell in the piping when I was replacing the valve which seems like that would be normal. I opened the box with the burners to see if I could smell any. I did not smell any there that is why it seems to me it is not getting gas. Should the valve click after or before the ignitor starts to glow?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Valve should click after igniter warms completely up. Do you have a volt meter to verify the 24v to valve?

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Customer reply replied 2 years ago
I don't have one but I can go to home Depot and check.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
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Customer reply replied 2 years ago
I just had my hand on the valve no click
Customer reply replied 2 years ago
Do I trace those wires back to the main control board?
Customer reply replied 2 years ago
OK and if I don't get the voltage there I maybe got a bad board out of the box?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

That is correct.Board should automatically send voltage to valve after a preset time (Usually 17 to 20 seconds) after igniter starts to glow.

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Customer reply replied 2 years ago
Alright I will go get a meter that reads ac
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Let me know what you find.

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Customer reply replied 2 years ago
One more question. After a valve is replaced will it sometimes take a few attempts to light or should that light on the first try?
Customer reply replied 2 years ago
Suddenly it fired up and now is firing on a consistent basis.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

May have had air in gas line then.

If you have further questions, please let me know.

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