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My Rheem Classic 90 plus furnace keeps turning off (after…

Customer Question
Hi, my Rheem Classic...

Hi, my Rheem Classic 90 plus furnace keeps turning off (after ~15 minutes)

Contractor's Assistant: Did you check the furnace's filters?

Yes replaced last week

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Contractor's Assistant: Anything else we should know to help you best?

Nope It has an ecobee thermometer

Submitted: 6 months ago.Category: HVAC
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Answered in 4 minutes by:
12/26/2017
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,407
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

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 your situation. I need the actual model number of your unit? It's on the BTU rating tag inside the burner compartment. Do you get an LED flash code on the control board when it shuts down?

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Customer reply replied 6 months ago
The model number is: RGRA-07EMAES
Customer reply replied 6 months ago
I'm not sure about the flash code with the LED
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago

How old is the unit? If you don't know then give me the serial number.

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Customer reply replied 6 months ago
was put in 2007
serial is: EH5D702F310004947
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago

Ok, this model has a green LED on the control board inside the blower compartment. I need to know what that green LED is doing when it shuts down (prematurely?). If it's flashing I need the flash sequence. How many times does it flash before it pauses and repeats

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Customer reply replied 6 months ago
Hi, I'm holding the button right now (it is not turning on yet, just humming). I have been holding for several minutes. The "OK" green LED is flashing twice at the moment every 2 seconds.
Customer reply replied 6 months ago
Will have to wait for the furnace to turn on and shut down to let you know what the LED is doing when it shuts down.
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago

Ok, a 2 flash is an open pressure switch error. Given that it takes 15 minutes to d=shut down you need to check all the hoses for water and all the condensate drains to be sure they are open and flowing.

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Customer reply replied 6 months ago
It was 2 flash waiting to turn on; it just turned on. I will let you know what happens when it shuts down early.
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago

ok

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Customer reply replied 6 months ago
Thanks, ***** ***** still going it is taking longer than usual to fail
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago

ok

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Customer reply replied 6 months ago
It got all the way up to the temperature without failing today.
HVAC Technician: Rick, HVAC Supervisor replied 6 months ago

Given your description the most likely cause for a failure like you describe is water in the draft pressure switch or the condensate tubing. The fix I described earlier is the most likely solution. I'd suggest you do it anyway.

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