I have a 15 year old Comfortmaker furnace. The heat exchanger was replaced in 2003 for free except for the labor to install.Now the heat exchanger is bad (cracked, ring left off). The tech who installed in 2003 is not longer available but I have his receipt with the model and serial numbers as followsModel: GDI078A012AINSerial: L934690028Is it worth replacing the heat exchanger for a 3rd time in a furnace this old or time to replace with more efficiency? Also what would make the heat exchanger keep going bad (cracking, etc.) could it be getting too much pressure /heat? or a duckwork problem. Please help. Thanks.
A heat exchanger shouldn't fail that often - it could be a bad design - get a new furnace before it poisons you to death with CO.
I would replace the entire unit - efficiencies are much higher, and some components are not likely to work together as well as they used to. Sounds like the unit is either creating too much heat, or not pulling it off well. I would also recommend using a different service, since they haven't found the real problem, but continue to throw parts at it. on the other hand this may be the weak link in THIS manufacturer's hardware. Jim
particular, that's a Goodman a hundred,000 btu unit with a three ton blowerpersistent, 80% effectual whilst new. a sparkling furnace deploy must be $2000 + or - . that's advisable to shop around. additionally, when you consider that all furnaces now comprise a 20 12 months guarantee on the warmth exchanger, that's advisable to ascertain with Goodman...you will choose the serial type which designates the month/12 months of mfg.
Get a new furnace. Could be the original installers didn't size the ductwork correctly and your not moving enough air to keep the heat exchanger within its normal temps. Make sure the people that install the new one check out the size of your ducts so that you don't have a new furnace but still the same problem.
If you have the means, replace the furnace because cracked heat exchangers = carbon monoxide. Since this is number three, going for four is kinda like playing Russian Roulette. :( Poor return and supply duct capacity might be the cause of failure. As well as improper fan speed (too slow) or dirty filters. An improperly adjusted gas valve or a botched fuel conversion could be a cause as well as faulty burner controls. Have these points checked/evaluated when you request bids for a new furnace. Any reputable HVAC outfit should be eager to answer your questions if they truly value your business.
