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Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 20090
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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Rheem fun ace new flame sensor won't stay lit 5 to 10 sec,

Customer Question

Rheem fun ace new flame sensor won't stay lit 5 to 10 sec
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: Just this season
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: No
Submitted: 2 months ago.
Category: HVAC
Expert:  Rick replied 2 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.

What is the model number of your furnace? what are you getting for an LED flash sequence?

Customer: replied 2 months ago.
Lock out indicator light. That's no help. Rheem classic 90 plus
Cleaned out drain also. Have 24v going from transformer to conto panel
Expert:  Rick replied 2 months ago.

That's a series not a model number. I need the model number off the rating tag. Also how old is the unit?

Customer: replied 2 months ago.
Rgra-07emaes 11/03
Expert:  Rick replied 2 months ago.

When the burner fires up what does the amber flame LED do?

Customer: replied 2 months ago.
Comes on and flashes one a second while burner is lit 18 times this time
Expert:  Rick replied 2 months ago.

Ok, if the flame LED flashes the signal from the flame sensor is marginal. If the lead from the sensor is good (no defects, solid connections) then you might have a bad ground between the furnace chassis and the board. The voltage generated by the flame sensor is minuscule. A bad board ground can introduce stray voltage. Of course I'm assuming the flame sensor is dead square in the flame and is heating up.

Customer: replied 2 months ago.
Only happens first cycle after that no light
Customer: replied 2 months ago.
Flame sensor is getting hot. Took it feels warm
Expert:  Rick replied 2 months ago.

Sounds like it could be a bad board. What happens when it doesn't light? does the igniter initialize? if so do you have 24 vac to the gas valve?

Customer: replied 2 months ago.
It light for 8 to 10 seconds and looses flame
Expert:  Rick replied 2 months ago.

Do you mean no flame LED?

Expert:  Rick replied 2 months ago.

When you say "after that no light" do you mean the flame LED doesn't light up at all?

Customer: replied 2 months ago.
No furace burner. Yes 24 volts at gad valve
Expert:  Rick replied 2 months ago.

So you have 24 volts at the gas valve and no ignition? no burner flame?

Customer: replied 2 months ago.
no flame light
Expert:  Rick replied 2 months ago.

no burner ignition?

Customer: replied 2 months ago.
For two three seconds then off
Expert:  Rick replied 2 months ago.

Ok assuming the flame is normal when it does fire up we're back to bad board or bad ground

Customer: replied 2 months ago.
Better off replacing furnace at its age or board
Expert:  Rick replied 2 months ago.

Furnaces are usually good for 20 years before they cost too much to fix. If you're going to do this then I'd try a new board. You should get another 7 to 10 years out of this unit.

Expert:  Rick replied 2 months ago.

Do you have more questions?

Customer: replied 2 months ago.
No
Expert:  Rick replied 2 months ago.

I'd appreciate a favorable rating

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