I have a problem and am hoping someone else has ran into this.
I have a Rheem modulating natural gas furnace that fails intermittently, however I have never been able to catch it in the act,HO says that it does not fire, although it does display the H on the board signifying it is receiving a call from W for heat and a modulating call at V. Talked to the Rheem distributors factory trained tech (supposedly) and was told to replace the control board, so I did that and am receiving the same result. When it should be heating nothing at all happens it just runs on continuous fan. I have checked all of the wiring thoroughly so I know there is not a short somewhere. Please help!