Just purchased and installed a new defrost timer for 'old faithful' - our GE S by S frig which, (except for a troublesome icemaker) always works just fine.
However, I find that overnite the new timer (6 hr. type) is allowing for a too long defrost cycle and temp rises to 55 deg's. by morning. I see the small adjusting screw on the front of the timer and rotating this screw (by some amount) restores the compressor.
I'm assuming that a 360 deg. rotation of the adjusting screw equals six hours of defrost - is this assumption correct?
I notice that two 'clicks' occur at 180 deg's. apart - so perhaps there are two cycles controlled by this timer?
Anyways, I'm just guessing so if someone could advise me about proper adjustment of the defrost timer - thanks in advance for your time.

Rob

V2K04 is partially correct, The defrost thermostat does terminate the defrost cycle, IF the timer dosen't do it first. The timer that you now have may be a 6hr timer, BUT, if it clicks twice in a 360 degree rotation, Then 1 revolution = 12 hrs. It ALMOST sounds like your timer is "STICKING" in defrost. Will it restart on its own? or do you have to advance it to get it to start.:)

Perhaps I should also note that I replaced the old timer because it was making a terrific noise but otherwise still worked and defrost was normal -

According to invoice - AP2636894 (WR9X33ODS) from APP.com,
Thx

The old one kept me awake all nite with a loud (buzzing/grinding) noise, at first I just disconnected the thing in order to get some sleep - the frig still worked fine, just didn't defrost & didn't seem to need to either!
Maybe I should disconnect this one too and just hook it back up when too much ice builds up! LOL