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I installed a new board. The same thing happened. The new…

Customer Question
I installed a new board...
I installed a new board. The same thing happened. The new board has three lights instead of two: PWR, OK & FLAME. The green power light is on, the ok light is flashing and the flame light is off. What does the error mean and how is it fixed?
Submitted: 8 months ago.Category: HVAC
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Answered in 1 hour by:
12/14/2017
HVAC Technician: Gaztech, HVAC Technician replied 8 months ago
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 937
Experience: Owner at Gaztech
Verified

I will need the exact make and model of furnace. Look inside it.

And count how many flashes between pauses

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Customer reply replied 8 months ago
Do you have the history of the last conversation?
HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

No history

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HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

Found history, let me read it

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HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

OK can you confirm the

flash code?

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Customer reply replied 8 months ago
Two blinks and then off, repeated.
HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

OK

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HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

2 Flash: Pressure switch or induced draft blower problem detected

Here is a video I made to explain how to fix

https://www.youtube.com/watch?v=2RRhiKmJ9Iw

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Customer reply replied 8 months ago
Ok. I took the wires off the pressure sensor and put the continuity tester across the two poles, with no continuity, then started the furnace and got continuity across the poles. My conclusion is that the pressure sensor is good. Is this a reasonable conclusion? If so, what should be checked next?
Customer reply replied 8 months ago
At this point, when I turn the furnace on, it lights for a few seconds and then the flame stops. In 30 seconds or so it lights again for a few seconds then the flame stops. Then the fan motor starts blowing unheated air into the house. I replaced the flame sensor with a new one, and no change. What causes the flame to stop?
Customer reply replied 8 months ago
There are two green lights steady on and the yellow flame light is off.
HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

If you tape the door switch close so that power stays on then start furnace, when flame is established amber(orange flame light on the control board should light up without esitation,if it flashes its no ggod if it doesnt, there is a bad signal, and furnace will shut off flame. if it doesnt light, means a bad ground

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HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

After you do this test Is OK light still giving two flashes?

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Customer reply replied 8 months ago
No flashes on the green ok light. The yellow flame light never turns on at all.
HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

Did furnace establish flame at all burners?

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Customer reply replied 8 months ago
all 4.
HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

OK

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HVAC Technician: Gaztech, HVAC Technician replied 8 months ago

When the flame started you should have seen ***** *****ght turn on, Check all ground wires, at main power source, at board, check wiring diagram to be shure. and plus you should of had a error code of flame failior????

I have to go out for dinner. I will opt out to let another tech help you.

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Customer reply replied 8 months ago
Good. Hopefully soon. Thanks.
Customer reply replied 8 months ago
Anyone there?
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