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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22511
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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i have a weak flame

This answer was rated:

i have a weak flame

My name is Billy

Are you on propane or natural gas?

Customer: replied 3 years ago.

natural gas

And is the main flame that when on that refer to as weak?

I assume you have seen the flame stronger?

Customer: replied 3 years ago.

the main flame is on until the blower turns on then it goes out

i also have a flashing yellow led

Thank you,

BEFORE the blower kicks on is the yellow light solid?


Customer: replied 3 years ago.



Thank you,

This is going to be one of a couple things...

1 - the gas pressure is insufficient and the flame cannot keep on the ignitor/sensor.

2- the ignitor sensor is not sensing the flame accurately and needs to be replaced. This unit does not use a sense uses the ignitor. Even though the ignitor glows and ignites it may be sending poor signal to board.

Now are you saying flame is weak because of the code ot because it is visibly weak?

Customer: replied 3 years ago.

i replaced the ignitor a couple months ago. the flame is abt 4 to 5 inches in diamiter

Thank you.

Then my concern is ....

the flame is actually hitting the ignitor.


the gas pressure is too low.

Not to many homeowners have a manometer to check gas pressure so that usually requires a service tech visit.

About the only things that can be done at this point is to clean the burner assembly & check gas pressure and adjust.

We have fuel and is just a matter of the circuit board being told it is there.

If you have any other questions at all just use reply to let me know.


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