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Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 20540
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I have a Rheem Criterion furnace. It will heat up and run at

Customer Question

I have a Rheem Criterion furnace. It will heat up and run at full heat for 5-6 minutes, then shut down. Then, once complete, it will again start up, run for 5-6 minutes... It will do this until the house is up to temp. Have replaced the filter...
JA: Sometimes HVAC issues that that you think will be really complicated end up being easy to fix. The HVAC Technician I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the HVAC Technician should be aware of?
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Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

I need the model number of your unit. It's on the rating tag inside the burner compartment

Customer: replied 1 year ago.
RGDG-15EARJR
Expert:  Rick replied 1 year ago.

Give me a few to pull the specs for your unit.

Expert:  Rick replied 1 year ago.

How long does it shut down before it starts up again?

Customer: replied 1 year ago.
less than 1 min. Almost automatically after the blower has run for a bit to disperse the heat
Expert:  Rick replied 1 year ago.

Could be a bad connection possible a bad ground. One possible source of a bad connection is the thermostat or thermostat wiring. If you want to try some troubleshooting try jumping the R & W terminals on the thermostat terminal strip in the furnace.

Customer: replied 1 year ago.
by jumping you mean run a wire between r and w?
Expert:  Rick replied 1 year ago.

Yes

Customer: replied 1 year ago.
Give me a moment. I should keep the wires connected to those intact, right?
Expert:  Rick replied 1 year ago.

You can leave the leads connected or not it doesn't matter. Also make sure you ave a good ground from the board to the junction box where the line voltage (ground) is connected to the unit.

Customer: replied 1 year ago.
Ok, have jumped the r and w. Restart?
Expert:  Rick replied 1 year ago.

Yes restart it. Be sure the blower door panel is properly in place or it won't run

Customer: replied 1 year ago.
Ok. Starter blower turned on. We'll see how long it runs. Shouldn't it run until the house gets up to temp set at thermostat?
Expert:  Rick replied 1 year ago.

Yes it should run until the thermostat is satisfied

Customer: replied 1 year ago.
Ok, burners are running....we'll see how long...Started at 3:07
Expert:  Rick replied 1 year ago.

ok

Customer: replied 1 year ago.
Curious. What does the jumping of R and W do?
Expert:  Rick replied 1 year ago.

Bypasses the thermostat and thermostat wiring

Customer: replied 1 year ago.
how will it now when it reaches temp?
Expert:  Rick replied 1 year ago.

If it runs for longer than it did before (you said ~5 minutes) then we can assume a problem with the thermostat or stat wiring

Customer: replied 1 year ago.
Just shut off. 3:13
Expert:  Rick replied 1 year ago.

Ok so not the thermostat. It gets more difficult to diagnose from here. Let it run and watch the amber /yellow LED on the board. Does it flicker or go out when the burner drops out?

Customer: replied 1 year ago.
i only see two green
Expert:  Rick replied 1 year ago.

You have no yellow LED?

Customer: replied 1 year ago.
no just two green
Expert:  Rick replied 1 year ago.

Is one designated FLAME?

Expert:  Rick replied 1 year ago.

If so then that's the one to watch

Customer: replied 1 year ago.
Here is a pic
Expert:  Rick replied 1 year ago.

If it's running then wait until it shuts down to check

Customer: replied 1 year ago.
One is labled "OK" one is labeled "PWR"
Expert:  Rick replied 1 year ago.

There are 2 versions of this board according to my specs. The one that has OK & PWR also has FLAME. The one that has 2 LEDS is labeled OK & FLAME. Let's see what happens when it shuts down.

Customer: replied 1 year ago.
When it shuts down, then the lights go off after the blower turns off
Expert:  Rick replied 1 year ago.

Both lights go out?

Customer: replied 1 year ago.
when all is shut down
Expert:  Rick replied 1 year ago.

Do you have a multi-meter?

Customer: replied 1 year ago.
Sorry no. Perhaps it is time to get someone out to look at it. It does heat the house, just does the on/off thing so it takes a while
Expert:  Rick replied 1 year ago.

The PWR LED should not go out as long as there is power to the unit. So either the power is dropping out or you have a bad board.

Customer: replied 1 year ago.
Thanks. I'll start there with the tech
Expert:  Rick replied 1 year ago.

You're welcome

Expert:  Rick replied 1 year ago.

I'd appreciate a favorable rating

Customer: replied 1 year ago.
Do you have the board number in case I were to replace it?
Expert:  Rick replied 1 year ago.

Here's the parts list Attached.you need to refer to your serial number for the right one. Since I don't know the age of your unit I'll also upload the other list in a minute

Expert:  Rick replied 1 year ago.

Here's the other one