Hi. I have a two year old RUUD gas furnace. It runs for exactly 8 minutes then everything shuts off and restarts after 30 seconds. This cycle repeats until the desired temperature is reached. I bypassed the thermostat, and the same thing happens. Any suggestions?

Answer

Sometimes a 2 stage furnace will do that between stages, but if it's consistently happening throughout the cycle and you've jumped the stat, I would first suspect the hi limit. Check your filter and if you haven't had the unit cleaned...it could be too much air is not getting out of the plenum. This is just a guess from afar and what I would check next if I were there.