I have got a Comfortmaker RPJ II Enviro Plus 90 furnace that has been acting flaky. I just replaced the induction blower, it started making off balance noises. And after removing it off I found that it very off balance was and the turbine was cracked). I also have issues with the furnace not starting up on every try. The induction blower will run and eventually turn off and try later. I've found the the system flashes 3 (pressure switch open). The next time it might fire right up.
If I let the induction blow start and remove the rubber tube from the inlet of the pressure switch (the tube the runs to the combustion box) the 3 flashes stop and the furnace fires right up, stays running until the house reaches temp.
I only disconnect the tube until the 3 flashes stop and reconnect.
I'm guessing it's the pressure switch not hold position, I've checked and all the tubes are clear.
Neither the intake or exhaust for the induction blower are blocked.
Any ideas?
If I let the induction blow start and remove the rubber tube from the inlet of the pressure switch (the tube the runs to the combustion box) the 3 flashes stop and the furnace fires right up, stays running until the house reaches temp.
I only disconnect the tube until the 3 flashes stop and reconnect.
I'm guessing it's the pressure switch not hold position, I've checked and all the tubes are clear.
Neither the intake or exhaust for the induction blower are blocked.
Any ideas?