Ask Experts Questions for FREE Help !
Ask
    RHEEMXE80's Avatar
    RHEEMXE80 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 24, 2010, 03:13 PM
    Rheem XE 80 "high temp limit switch" fault
    On my Rheem XE 80 downdraft gas furnace, I'm getting intermittent heat. Getting error code of 4 blinks on the single red LED, which means "high temp limit open".

    The purge fan has been cleaned (it was very dirty) and the vacuum line to the vacuum switch is not plugged. Vacuum switch itselfs works perfectly - tested with a multi-meter. The two flame sensors work fine - have zero resistance. Installed a new igniter - the old one was 14 years old, but the problem persists. I pulled the high limit switch, which sticks 2-3" into the combustion chamber, and it was nice and clean. It shows zero resistance at room temp. Air filters are freshly cleaned.

    I installed a new 'generic' White Rodgers board in this furnace two years ago, when the mechanical relays on the OEM board failed. So this board is only two years old.

    I don't THINK I have a true high limit problem. The repairman can't come for at least three days. What should I look at next?
    RHEEMXE80's Avatar
    RHEEMXE80 Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Dec 27, 2010, 11:53 AM
    Update: seems that there was a broken solder joint on the control board that was causing the "high limit" fault code. The board is only two years old, but was installed with a little bit of sideways stress on wiring to the main molex connector. I'll try to re-solder the post, if that doesn't work, have to get a new board.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Limit switch is open rheem [ 2 Answers ]

I have a Rheem furnace Criterion II that will not blow air. I can hear the gas flame kick in but the blower never starts. The LED on the control board blinks 3 times then off for 2 seconds which is suppose to indicate limit switch open. Should I rely on this and replace the limit switch? Is their a...

Rheem Classic 90 Plus furnace not heating well: Limit Switch Open [ 4 Answers ]

Hi, First off, many thanks to all who frequent this forum and help each other out. It's really appreciated. I have a "Rheem 90 Classic 90 Plus" gas furnace. For the last few days it has not been heating the house as well. It works for a short time then quits, then comes up again, and quits,...

Rheem Gas Furnace Fan limit switch settings Model # 3214-100fb [ 1 Answers ]

What are the proper settings for this particular model. The fan stays on way to long after the heat/fire shut down, which then causes the house to cool down quickly.

High temp limit [ 1 Answers ]

Working on an older bryant furnace was off on ahigh temp limit shouldn't blower still come on to help close limit

High limit switch [ 2 Answers ]

Im replacing my limit switch which is located in the heat exchanger. What does a high limit switch actually do? Thanks.

View more questions Search