I have a heater guy coming over to give me an estimate on a new oil heater and air conditioner. He suggested Kerr, which he put is the mercedes benz of the heater world. He also suggested a Bryant. He also said something about putting in an riello burner. How are these? Are they good brands? Any help would be great. Thanks.

Dear Experts: I have a one year old Concord (Lennox) 80% gas furnace that shuts down about 5 minutes after kicking on without reaching the shut down temperature. I can get the furnace to restart for another 3 minutes by turning the thermostat Heater switch to off then on again, which resets the furnace. It did this at the beginning of last winter with the solution being the replacement of the dirty air filter. This year, I have the same problem but a new clean air filter did not solve it. The sequence of operation: Reset Furnace by turn thermostat heat switch off than on again. After a 15-second pre-purge, the control energizes the hot surface igniter. After warm-up period, the main gas valve energizes and the main burner ignites. The air blower energizes following a 30-second delay. After 5-minutes, the burners shut down. 45 seconds later the blower shuts down. The last time I restarted the furnace, it went through the aforementioned cycle and then the blower clicked on again and 15 seconds later the H I S reignites The built-in self diagnostic system is showing a failure code for an open limit switch or limit switch circuit. Here are the specs of the furnace: Concord (Lennox) 80% Gas-Fired Furnace Model: CG80UA 100,000 Btu Natural Gas Instant Start Any Ideas about what is wrong? Thanks