Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Home HVAC

steve325is on Fri October 10, 2008 10:52 AM User is offline

Year: 1978
Make: Carrier
Model: 58GS-75-3
Engine Size: ??
Ambient Temp: 75 F
Country of Origin: United States

I came home day before yesterday to find the fan in my Carrier natural gas furnace (split unit) running. I know there had been a power failure or surge during the day because the garage door opener had to relearn, the microwave clock was 00:00, the PC had rebooted, etc.

The A/C works, but the heat does not. The pilot comes on, but the burner does not light.

I ASSume the control board took a dump and the fan is running because that it its default mode. I have found replacement boards from $48-$350, which seems like quite a spread. Carrier's number on the board is 302075-302.

What say the home HVAC experts? Am I on the right track?

Thanks,

Steve

mk378 on Fri October 10, 2008 11:11 AM User is offline

Have you tried to reset it by cutting the power for a few minutes and turning it back on?

NickD on Fri October 10, 2008 11:12 AM User is offline

Is this that electronic ignition module? If so, had a similar problem with mine, not suppose to take it apart, but did anyway, had two relays, one for the pilot, the other for the main valve if the pilot was on and detected, would switch in the main valve relay. Both had relay contacts so bad, nothing left to clean so replaced both relays with new ones, working great again, spent around ten bucks.

steve325is on Fri October 10, 2008 11:30 AM User is offline

mk378 -- Yes. In fact, it was unplugged all Wednesday night and all Thursday. The blower starts running as soon as the furnace is plugged back in.

Nick -- Dunno, Carrier calls it a control board. It is the only "electronic" piece in the furnace. It has two relays on it, but they don't *appear* to be sticking. I can post a picture tonight when I get home.

-- Steve

MrBillPro on Fri October 10, 2008 11:40 AM User is offlineView users profile

Quote
Originally posted by: steve325is


What say the home HVAC experts? Am I on the right track?
Thanks,
Steve


Steve, being a 1978 personally I would have someone thoroughly check out the unit especially the heat exchanger, "most" heat exchangers back then were only warrantied for 10 years if your in any climate that really cold winters, I would bet the HX has "some" cracks or pinholes neither is good and would justify a replacement if I were on that call. Now moving on, if the fan is running continuously probably on that year model it could be the control module, if it were a newer unit 1993 and up I would say one of your limit switches are open this will cause the fan to run continuously "safety feature". Yes you could buy you a new module online and it "might" solve your immediate problem, but take it from a Pro, if you have any small children and you value your life call a Pro just to take a look at it a service call is cheap compared to a life.


-------------------------
Don't take life seriously... Its not permanent.

NickD on Fri October 10, 2008 12:41 PM User is offline

Had, my furnace apart last week, yeah, my heat exchanger is over 23 years old. What I couldn't believe was the carbon build up over the last year, getting a very nice blue flame, checked the entire chimney for restrictions, good air flow.

Can only contribute this to the quality of the natural gas I am paying three times the price for, are they adding powered coal to it? Is it made in China? Are you seeing the same thing?

Well, it's nice and clean again, and really don't want to pay somebody 75-85 bucks an hour to come here and clean my pipes. Actually would be cheaper to toss that dirty furnace away and put in a new one. But that will get dirty too. Still vividly recall the days I was shoveling coal and hauling out ashes, that is much easier today.

steve325is on Fri October 10, 2008 3:02 PM User is offline

Mr Bill:
This unit was cleaned and inspected by a pro last year. He said that everything looked good. The thermocouple and the gas valve have both been replaced professionally in the last 5 years. I am in Northern California, so our winters are not what most would consider cold. I have fuscias growing in my front yard that survive over the winter without being covered.

My thoughts of possibly fixing this myself have more to do with saving time than money. If I call a pro, I will most likely have to take a vacation day from work. I live about 45 minutes from work, so I can't just "pop home" with 10 minutes notice.

I appreciate everyone's input. I still may call a pro, I'm undecided.

-- Steve

MrBillPro on Fri October 10, 2008 9:13 PM User is offlineView users profile

Quote
Originally posted by: steve325is
Mr Bill:
My thoughts of possibly fixing this myself have more to do with saving time than money. If I call a pro, I will most likely have to take a vacation day from work. I live about 45 minutes from work, so I can't just "pop home" with 10 minutes notice.
I appreciate everyone's input. I still may call a pro, I'm undecided.

-- Steve


I understand but as a Pro I have to give Professional advise or I would not be considered a Professional, I hope you can appreciate that.
Take Care
Mr. Bill


-------------------------
Don't take life seriously... Its not permanent.

Back to Off Topic Chat

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.