Carrier Heat exchanger has failed in a five year old furnace Nationwide

Heat exchanger has failed in a five year old Carrieir furnace. They have offered to supply a new heat exchanger however they require me to pay the $800 installtion. This is the same issue their previous model had that there was a class action law suit they lost.

They have no interest in finding the root cause of the failure and thus I am concerned it will fail again and is potentially a safety issue.

I asked them to apply the replacement cost of the heat exchanger to a new furnace that would have a warranty however they stated that was not possible.

Very concerned about safety and viabilty long term of the furnace based on their previous issues and also the dissapointing response they provided to us.