I once had spiders build a nest inside the main contactor for the compressor. The "pros" sold me a hard-start kit before I found the real problem.
> -----Original Message----- > From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of > Kaleb C. Striplin via Mercedes > Sent: Wednesday, August 05, 2015 11:03 AM > To: Mercedes Discussion List <email@example.com> > Cc: Kaleb C. Striplin <ka...@striplin.net> > Subject: Re: [MBZ] OT AC Unit > > With the exception of that one time the outside unit seems to be off but the > inside unit is running at random. There are some back door settings in the > thermostat that I adjusted slightly but nothing that I would think would affect > it. I agree it sounds like a relay or control board issue. If the thermo sends 12v > signal to turn on unit, then if the thermostat is removed the 12v signal is > removed and that should turn off the unit. If this is the case I think that rules > out the thermostat as the problem. > > Sent from my iPhone > > > On Aug 4, 2015, at 10:52 PM, G Mann via Mercedes > <firstname.lastname@example.org> wrote: > > > > The thermostat sends a 12 volt signal [typically] which triggers a > > relay in the outside unit which connects 220 volt lugs to run the > > compressor pump and the cooling fans for the outside condenser. > > > > Very often, the symptoms which you describe, happen when the 220 Volt > > contacts become worn from arcing on contact and then "stick together". > > Another thing that happens is the springs that force the contacts > > apart when the thermostat signal says "disconnect" become weak and the > > contacts stay connected.. > > > > It will of course cause your compressor to fail from overheating after > > running for hours while you are away from home [don't ask how I > > learned this]. > > > > I suggest it's a good time to call your local AC company for a service > > call, if you don't feel comfortable addressing it yourself.. > > If you do.. pull the service disconnect prior to opening anything > > electrical and of course be sure your unit is not going to kill you. > > > > Good luck > > > > Grant... > > > > On Tue, Aug 4, 2015 at 8:34 PM, Kaleb C. Striplin via Mercedes < > > email@example.com> wrote: > > > >> So the inside unit has been running a while but outside unit not, its > >> at set temp of 73. It turned off a minute ago for about 1 minute and > >> now has turned back on again. Thermstat says its calling for cooling > >> and outside unit is running. Will see if it turns off in a few > >> minutes > >> > >> > >>> On 8/4/2015 10:18 PM, Kaleb C. Striplin via Mercedes wrote: > >>> > >>> A couple of weeks ago I noticed the blower would kick on at random > >>> on the house ac unit even when it did not call for cooling (outside > >>> unit not running just inside unit). Sometimes it would run for 30 > >>> seconds then shut off. Sometimes when it does call for cooling when > >>> its done it will shut off then a couple of minutes later the inside > >>> unit will kick on. I was not sure if this was some sort of feature > >>> or what. Anyway, last night I noticed it was starting to get cold > >>> in the house and it had been blowing for a while. Thermostat was > >>> set to go to 73 at night. It was 71 inside temp indicated in the > >>> thermostat which was below the set temp. The outside unit was > >>> running but it seemed to be stuck. Not sure if it is a thermostat > >>> issue or some sort of control board issue on the inside or outside > >>> unit. I turned the thermostat off and it continued to run. I even > >>> actually removed the thermostat from the wall base plate so it was > >>> not connected and it still ran. Question is, should it not > >>> completely shut down if the thermostat is removed or if the stat was > >>> stuck in cooling mode and sent signal to the unit to turn on, will > >>> it continue to run until a signal is sent to turn it off so in other > >>> words even with thermostat removed it is not sending the off signal? > >>> I ended up flipping the breakers off for a minute then back on. I am > thinking the outside unit did not come back on but the inside unit did and > blew for a while then eventually shut off. > >>> Sitting here right now I am thinking I am having the same problem. I > >>> just cant figure out why it seems to only do it at night. > >>> > >>> _______________________________________ > >>> http://www.okiebenz.com > >>> > >>> To search list archives http://www.okiebenz.com/archive/ > >>> > >>> To Unsubscribe or change delivery options go to: > >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > >> > >> _______________________________________ > >> http://www.okiebenz.com > >> > >> To search list archives http://www.okiebenz.com/archive/ > >> > >> To Unsubscribe or change delivery options go to: > >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ > > http://www.okiebenz.com > > > > To search list archives http://www.okiebenz.com/archive/ > > > > To Unsubscribe or change delivery options go to: > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com