I have a 3 yr. old Trane Model 4TXCB036BC3HCAA. During the 2nd heating season the ignitor failed and was replaced with a Trane replacement. Now in the 3rd heating season it has repeatedly locked out. The following have been done by my HVAC contractor
Cleaned the flame sensor
Check the intake and exhaust piping and found no problem
Cleaned and inspected the condensation hoses and piping, again no problem
Replaced the pressure sensor
System continued to lock out after all these efforts and only flashes a lock out code after each failure to ignite.
Now the 2nd ignitor has failed an again replaced with a Trane part. Not certain if this failure is independent of the of the lock out issue or the cause. The ignitor should last significantly longer than this. I'm doubtfully that the root cause has been found. Any ideas I can pass on to my HVAC guy?
Thanks in advance for your suggestions