Originated From
AOL Search

Trane xl 80 trouble shooting. the red warning light is flashing 4 times. it is an open high limit switch. what is this and can i fix it.

trane xl 80 trouble shooting.  the red warning light is flashing 4 times.  it is an open high limit switch.  what is this and can i fix it. 

Liked this question? Tell your friends about it

2 Answers

Order by
Oldest to Newest
Newest to Oldest
Votes

Check to be sure that you have enough registers open. Approx. 75% min. Check to be sure your filters care clean. Check gas pressure is to the factory setting 3.5" WC for gas. Pull Center limit, let cool and then check continuity. These are the most common problems. There are others but try this first.

PROBLEM:
Trane XL80, Model # TDE060A936M1 gave error code of "Open Temperature Limit circuit" represented by 4 flashes on the control board LED. Technician diagnosed the problem to be a failed control board and quoted me $575 to replace it.

SOLUTION:
The female pin head for the wire from the Temperature Limit Switch housed inside the plastic casing was pulled and did not connect to the male pin on the control board. When I pushed the wire to push the female pin head further inside the plastic housing, it made contact with the male pin on the control board and my gas burner started after a shutdown and restart. Finally, I got heat but it took a lot of troubleshooting to find the simple problem.

TROUBLESHOOTING DONE:
+ Replaced the control board with brand new control board # CNT 03797. Bought it from eBay for $95.
+ Cleaned the temperature gauge rod. This is a thin rod (on left side of the burners) that is bent to be in the line of the flames. It gives the signal to shut off the igniter (on right side of the burners).
+ Jumped the Temperature Limit Switch using a paper clip connecting the 2 wires.
+ Looked for any limit switches that were tripped.

ABOUT THE TEMPERATURE LIMIT SWITCH: It is the size of a credit card and is stuck on the inside wall right above the gas burners with 2 wires connected to it. It is essentially a meta disc that will expand if the temperature rises too much. It is the only limit switch on the Trane XL80 that does not have a manual reset button and so you most likely have to replace it if it is tripped but sometimes taps on the face of the limit switch can help restart the furnace short-term.

Several people have shared their experiences online, which helped me a lot to troubleshoot. I hope my experience helps somebody too. Good luck ? Mihir Rao

Related Questions

Other people asked questions on similar topics, check out the answers they received:

Asked: We had a high efficency furnace installed in ...

We had a high efficency furnace installed in Jan. and it does not seem to heat the house. My wife complains her feet are always cold and the installer says turn up the stat.In order for us to be ...

Asked: Do geothermal heat pumps work as well as ...

This is a question for people using a geothermal heat exchange system - are you happy with it? Does it work as well as advertised? My primary concern is that once you exchange heat geothermally, the ...

Asked: Troubleshooting a carrier 50zh unit,will not blow ...

troubleshooting a carrier 50zh unit

Ask a Question... We'll forward it to people who know

More Questions

Why the encryption keys red right flash ?

IT'S GONNA BLOW!!!!!!!!!!!!!!!!!!!! Run, Forest, Run. Don't go back for the chocolates!

Switch Screen name Status unavailable on every try.. Is there a

I think it's an AOL problem. I saw it also.

How to start a small LED lighting plant

You'd better tell us which aspects of LED lighting business you are going to engage in development and production of, either simple assembly of LED lighting products or research and development and production of power or chip or lamp housing or other LED lighting components, most of LED lighting ...

What color high lights should I get

Blonde!!!! It'll look better than red!!!!