I have a Trane XL80 that tries to heat but sometimes fails with a call for heat, but no flame detected. It is not the flame detector as the flame is not there. It turns on the gas, but the ignitor never gets hot. I replaced the ignitor to no avail. I don't want to replace the control board, around $160, without making sure it has to be done. The control board was changed out when the furnace was a little less than two years old by a technecian as it was under warranty. I thought then I might be in for many years of trouble with this furnace... Isn't there a reliable check to verify which part is bad? Can't I repair or improve/modify the board to work more reliably? What do you reccomend?
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__!__ -----o----- " " fix-it dad