I had a Carrier Heating/AC unit installed during the summer of 2004. The first winter the system would not come on or when it did only heat with very low or no fan speed. It displayed a Code 13 Limit Circuit Lockout which also refers to Code 33 Limit Circuit Fault. The HVAC technician could find nothing wrong and said the items listed under Codes 13 and 33 were not the problem.
On the second visit a week later same code etc. he replaced the circuit board because that is what he was told to do by the HVAC sop owner.
Now 5 years later I have the same problem (Code 13) and the technician said he cant find anything wrong and it is not related to Code 13 or 33. Any advice or help would be appreciated.
Is this a known problem with these units? Will I have to pay for a new circuit board every 5 years or so?