msun101
Dec 12, 2009, 10:03 PM
I have York diamond 80 furnace. It is about 12 years old and works fine. Except one problem happens intermittently. Once a day or a few days, the furnace blows hot air.
Once it reachs the set temperature, it will not stop and keep blowing hot air and then
Change into room temperature air. Turning off in the thermostate will not shut it. I have to turn the furnace off from the circuit breaker and then everything start working again
For sometime. This is seems happens more often in the morning when the day temperature kick in and the furnace is working very hard to bring up the house temperature.
I have search the internet and cannot find anyone with similar problem. Would you please let me know what is my problme and how should I debug it? By the wayl, the filter is seems clean.
Once it reachs the set temperature, it will not stop and keep blowing hot air and then
Change into room temperature air. Turning off in the thermostate will not shut it. I have to turn the furnace off from the circuit breaker and then everything start working again
For sometime. This is seems happens more often in the morning when the day temperature kick in and the furnace is working very hard to bring up the house temperature.
I have search the internet and cannot find anyone with similar problem. Would you please let me know what is my problme and how should I debug it? By the wayl, the filter is seems clean.