Check out some similar questions!

Bob Piccinini · Mar 16, 2009, 10:01 AM

I have a Carrier 58GS furnace. It appears to be operating fine until I stood next to it.
The gas flame comes on and off about every 5 seconds. This is not to be confused with short cycling. The blower is running as it should be and at the appropriate times. Thought before I dug into it, the forum may already have the answer.

Thanks for any help,

Bob

wmproop · Mar 16, 2009, 09:10 PM

Try cleaning the flame senser,, is located near the burners,don`t confuse it with the igniter

Bob Piccinini · Mar 16, 2009, 09:28 PM

Originally Posted by wmproop

try cleaning the flame senser,,,,,is located near the burners,don`t confuse it with the igniter

Thanks wmproop, I'll give it a shot.

white732 · Mar 16, 2009, 10:17 PM

Is your Carrier 58GS equipped with a "standing pilot" ignition system, or does your furnace have a "electronic spark ignition"system?

Bob Piccinini · Mar 17, 2009, 04:19 AM

Originally Posted by white732

Is your Carrier 58GS equipped with a "standing pilot" ignition system, or does your furnace have a "electronic spark ignition"system?

Electronic Spark, I miswrote earlier, it is a 58DR

hvac1000 · Mar 17, 2009, 05:45 AM

If you have a 3 wire pilot that can be the cause.

white732 · Mar 17, 2009, 05:52 AM

Bob, your pilot assembly would be the first starting point, it's the cheapest and first place to start. After 20 years it's the primary cause for your problem.

white732 · Mar 17, 2009, 05:55 AM

Bob, I miss wrote. I have retired with 20 years in the field and found your type of pilot will cause your problem.

wmproop · Mar 17, 2009, 10:21 AM

Quote;;The gas flame comes on and off about every 5 seconds.

I understood this to mean the pilot was working,, but the flame not staying on in the burners

wmproop · Mar 17, 2009, 10:23 AM

Guess I understood the pilot was working but the flame in the burners was going out every 5 seconds

Bob Piccinini · Mar 17, 2009, 11:09 AM

Originally Posted by wmproop

guess I understood the pilot was working but the flame in the burners was going out every 5 seconds

The above quote is correct. I cleaned all connections along with the flame sensor. It is working for now. Looks like it is the pilot assembly causing the problem. Won't hurt for me to get a new one regardless. Thanks for all the help and rapid responses. First time on this forum and it was a great experience.

Bob

hvac1000 · Mar 17, 2009, 12:01 PM

The old 3 wire pilot will allow contact for a few seconds then drop out the gas valve then make connection again. This has been a longstanding problem with the 3 wire pilots. Years ago we used to adjust them in the field but no more just replace. All during this time the pilot will be on.