Many of these units have developed serious operational issues or have failed completely.
Carrier furnace heat exchanger problems.
The carrier high efficiency gas furnace trade in allowance program is designed to offer homeowners an alternative to replacing only the heat exchanger under the terms of their limited lifetime heat exchanger warranty on a first generation carrier condensing furnace if their furnace experiences a heat exchanger failure.
Carrier high efficiency gas furnace heat exchanger issues one the most common issues found in carrier high efficiency gas furnaces is corrosion or blockage is their secondary heat exchangers in approximately 5 to 10 years after the original installation date or in other words premature secondary heat exchanger failure.
Probably both heat exchangers are going on mine because there is condensation in the furnace and a contractor came over yesterday and showed me a vertical crack at least an inch long in the primary heat exchanger.