Have a Trane XE90 and it's blowing air but the Igniter will not go on. The boards LED is flashing 4 times. I moved in 2 years ago and replaced the igniter about 2 months ago. The prevous owner did not leave me with the manual with the codes. If anyone out there knows what the codes mean It sure would be apprieciated, it's going to be a two dog night. Only problem is I have a Jack Russell who provides too little heat and a Bullmastiff that pushes me out of bed.