Hello! Long time lurker here, however this is my first post.
Having an issue with my Carrier Furnace and was hoping someone would be able to provide some insight to the cause.
Sporadically during the overnight hours the past two weeks my heater has been shutting off. This only occurs during the overnight hours between midnight and 4am. The led is flashing error code 13, which translates into an error 33 "Limit Circuit Fault" code as per the owners manual. When the heater malfunctions/shuts off, it emits an odd odor throughout the house as well. Turning the power off and then back on seems to clear the code each time and allow it to run the rest of the day. Up until recently (last evening) the heater would function as normal until the overnight hours. Last evening I was able to observe more of what was happening: I noticed that the thermostat would call for heat even when it indicated the same room temperature as that where the heater was set for....room temp was 71 and heater was set to maintain 71....even then, it would call for heat (you can hear the "click"). The small induction motor comes on prior to the flame ignition, the flames ignited however the large blower motor did not turn on. I could then see the 13 led code flashing. A few moments later the flames/gas shut off and then the large blower motor came on and ran for several minutes. I'm not sure but the odor we're smelling might be that of the excessive heat coming off of the heat exchanger?
Ive checked the duct work - all open and no change since the installation of the heater and duct work (approximately 5 years ago). The filters are clean and I don't know of any obstructions. I will be checking the exhaust and fresh air intakes this afternoon for any blockages.
If anyone has any other suggestions or may have seen this before....any an all input would be greatly appreciated. I'll likely be calling a technician later today to look at the unit.
My apologies for such a long post, however I wanted to be as descriptive and thorough as possible.
Having an issue with my Carrier Furnace and was hoping someone would be able to provide some insight to the cause.
Sporadically during the overnight hours the past two weeks my heater has been shutting off. This only occurs during the overnight hours between midnight and 4am. The led is flashing error code 13, which translates into an error 33 "Limit Circuit Fault" code as per the owners manual. When the heater malfunctions/shuts off, it emits an odd odor throughout the house as well. Turning the power off and then back on seems to clear the code each time and allow it to run the rest of the day. Up until recently (last evening) the heater would function as normal until the overnight hours. Last evening I was able to observe more of what was happening: I noticed that the thermostat would call for heat even when it indicated the same room temperature as that where the heater was set for....room temp was 71 and heater was set to maintain 71....even then, it would call for heat (you can hear the "click"). The small induction motor comes on prior to the flame ignition, the flames ignited however the large blower motor did not turn on. I could then see the 13 led code flashing. A few moments later the flames/gas shut off and then the large blower motor came on and ran for several minutes. I'm not sure but the odor we're smelling might be that of the excessive heat coming off of the heat exchanger?
Ive checked the duct work - all open and no change since the installation of the heater and duct work (approximately 5 years ago). The filters are clean and I don't know of any obstructions. I will be checking the exhaust and fresh air intakes this afternoon for any blockages.
If anyone has any other suggestions or may have seen this before....any an all input would be greatly appreciated. I'll likely be calling a technician later today to look at the unit.
My apologies for such a long post, however I wanted to be as descriptive and thorough as possible.
