furnace kicks back on....why? - http://www.hvacmechanic.com/ Forums

Original message

BN31

68.0.111.140

"furnace kicks back on....why?" , posted Wed 5 Jan 19:38

Have a Rheem furnace. It kicks on and runs it's course....all great. When it kicks off, it's off a couple seconds then kicks back on for about 3 seconds then goes off til the house cools down again. Why does it come back on for the few seconds? Thanks MUCH for your time!

Replies:

zekeman

69.37.158.60

"Re(3):Please help....freezing!!" , posted Thu 6 Jan 00:36

The low limit thermal switch is set too high. I would set it at about 80 degrees. Mine was set at 100 and after I reset it , the problem went away.

BN31

68.0.111.140

"Re(1):furnace kicks back on....why?" , posted Wed 5 Jan 22:38

Only the fan.....

londonguy

69.156.6.155

"Re(2):furnace kicks back on....why?" , posted Wed 5 Jan 22:42

limit switch turning fan on

residual posibly still in furnace off of heat exchanger or faulty limit switch
probally a honeywell

phil

londonguy

69.156.6.155

"Re(1):furnace kicks back on....why?" , posted Wed 5 Jan 22:30

is the burner or fan coming on????

phil

BN31

68.0.111.140

"Re(2):furnace kicks back on....why?" , posted Wed 5 Jan 22:41

Put it on the wrong one. Sorry. Only the fan comes on.

Apprentice

208.45.73.9

"Re(3):furnace kicks back on....why?" , posted Fri 7 Jan 08:57

Residual heat left in the exchanger like londonguy said. No big deal. Or you can set the on setting slightly higher if it annoys you.