I have the same system, CONQUEST 90, and it stops working after 1 1/2 year from brand new!!!!!!!!! Furnace refuses to turn on. I check the electricity, it is fine. And there is no gas leakage. The part to turn on the ignition is from HoneyWell, but it won't matter, it is from Heat Controller Inc. Bad experience, would like to report to consumer report to file a complain.