a furnace
a furnace uses air pressure sensors to measure air flow in the furnace. This ensures that the flame from the natural gas is contained and does not present a hazard to the home.
For the second time, or third time, this furnace model stopped working because of the air pressure sensors. watch the video to learn more about the air sensors and how to troubleshoot them with a ohm meter and with a 9 volt alkaline battery.
Use the window in the door of the Rheem furnace to check the light (led) status and blink codes. Four (4) blinks means the pressure switches are probably at fault. the inside of the door has the complete troubleshooting codes and a fault isolation guide.
Use compressed air to clean any dirt near the burners and other parts.
These sensors are on a Rheem prestige series furnace from 2007. See model # below in the photo. Rheem Prestige series. Super quiet 80 Two-stage. Not sure what Two-stage means?
Model RGPR-07NBRQR. Made in Fort Smith Arkansas. Category 1 forced air furnace. 52,000 btu and hour.
see the diagram below. you have lpc and hpc pressure switches highlighted in red color. also the blink codes are listed and code 4 is shown in red.
Parts breakdown and diagram here
I cannot begin to express how sensitive these air pressure switches are. When malfunctioning, you can tap them and the furnace will start working!!! Seen the movie where the guy kicks the machine and it starts working? This can happen with these pressure switches. They will get stuck in the closed position and a slight nudge will pop them open. The computer checks if the switches are in the closed position at startup – if they are, the furnace will NOT START. This is a common problem!! In a few words – the pressure switches, THEY ARE SENSITIVE and I hate them! They are necessary for the safety of the furnace. . . and they are designed to sense the minor changes in air flow that happens when the furnace fan is degraded. Again, you will learn. And so true , you will hate them. Save yourself some time and read up on the furnace. Watch the video to see how troubleshooting the pressure switches can be difficult.
It did cross my mind that perhaps these switches that I bought are faulty, and at least one of them was faulty as in it would stick in the closed position. I believe they do not make these as good as they used to. . . perhaps less copper or a weaker spring?
It may take you several tries to figure out the problem. You will learn that failure is not the end but rather a stepping stone to success.
— Rod Deluhery
If you’re looking for a repair guide that goes beyond surface-level conversations and dives deep into the heart of what it means to be human, this is it. Repairing a furnace is a transformative experience that will broaden your horizons, challenge your perspectives, and remind you of the power of humility. . . because you will fail!:) Be prepared to be discouraged, hateful, and full of spite.
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