My gas furnace seems to only stay on for 10 min. then completely shuts off and in 5-10 secs the gas lights and blower comes on as normal and heating the home again. Service tech says no trouble codes noted. It is set for 5 cycles per hour, so I assume it would only stay on for around 10 min at a time?? I set the CPH to 2 or 10 the furnace still only stays on for 10 mins. New filter and vents are open, stat set to 90 degrees (home temp is 68) seems to work ok other the the frequent cycleing, but due to this it does not seem to heat the home efficiently and also I would imagine more wear and tear.
Is this normal? Anything I can look for?