Greetings! First time poster, but long-time owner of a Trane furnace with problems. I hope this post doesn't break any rules.
I am a homeowner with a Trane model # TDE080A945M1 serial# 314X1R26 gas furnace that was purchased by the folks from whom we purchased our home. We've had multiple issues with this furnace...seemingly something has gone wrong each of the last 5 or 6 years.
Currently, we are having issues with the furnace not lighting and eventually locking-out after 3 attempts (2 light flashing error code). When the t-stat calls for heat, the igniter glows orange but the burners don't light. Rarely does it ever seem to light on the first attempt. It doesn't always lock-out each time it calls for heat. However, lately I've had to reset the furnace 5 or 6 times per day. Luckily, it eventually lights and gives us heat...but it seems to be getting worse. I am curious in your opinion of what may be causing this issue. My wife and I are extremely frustrated.
Here is a recent timeline of what's been going on with our furnace.
Feb 2011: We started having heating issues in January 2011. After a month of troubleshooting and multiple service calls by our hvac contractor, the control board was replaced. This was the 3rd control board we've had in just over 7 years. This was also replaced in 2007. This fixed last Winter's problem for the remainder of the heating season.
November 2011: After a month or so of having isolated issues of locking-out after 3 attempts, I called our hvac contractor. After conducting a thorough servicing and check-up on the system, the only issue they could find was that the Flame Sensor was only testing at 1.9 amps. They cleaned the flame sensor and it then tested at 2.3 amps. The air filter was changed, the gas pressure was OK, and everything else seemed to be in perfect running order. They just said that it was probably because of the corrosion that develops on the flame sensor. Since our hvac system is in our laundry room, I understand that lint may cause some issues with the sensor. We also do not have an outside air source, however we always keep the laundry room door open for better airflow.
December 2011: After 2 weeks of working well, the furnace started having the same lock-out issues after 3 attempts to light. It progressively has gotten worse. After once again changing the air filter, I replaced the Flame Sensor with a replacement part I purchased from the local Trane parts store. Unfortunately this has not helped to fix the problem. I still have to reset it multiple times each day. Luckily it does turn on after a few attempts.
So what now? Since the flame sensor is new, the gas pressure is OK, and everything else checked out OK in November, could it possibly be the igniter?? It always glows orange on cue, but do you think this could be the cause of our problems.
I would love to be able to suggest something to our hvac contractor. I really like them, but it gets frustrating having to call them multiple times each year. If it is something as simple as the igniter, shouldn't that be something they should've thought of already?