Latest Discussions : HVAC

dlbrad77

10:51AM | 07/27/07
Member Since: 07/26/07
9 lifetime posts
Hello, I just moved into a house that had to have a thermostat installed. After installation I noticed the AC will not shut off. I have it set in auto, but when I raise the temp on the thermostat it doesnt do anything. The AC will turn off outside, but the fan constantly runs and the blower inside constantly runs. If I switch it off they will both go off. Any Ideas?? It is a ducane system.

dlbrad77

11:21AM | 07/27/07
Member Since: 07/26/07
9 lifetime posts
Now after I took apart the thermostat to look at it, it shuts of when I switch it from auto to on. Hmmmm????

MistressEll

06:55AM | 07/28/07
Member Since: 01/30/05
360 lifetime posts
First if you switch from AUTO to ON and the fan goes OFF sounds like a wiring error.

Second a dual mode thermostat has to be set for HEAT or AC - as a higher set temp would keep the fan running in heat mode (the fan runs until the temp is reached) to get the fan to stop running in a higher set temp - you would have to have the thermostat in AC mode.

As it is presently set up...if you dia the set temp DOWN does the fan stop?

You might also not have the right voltage settings for your fan. Some thermostats are adjustable some are not. You really have to know what voltages are required for your system.

Most common are low voltage but there are also line voltage systems.

dlbrad77

07:20PM | 07/28/07
Member Since: 07/26/07
9 lifetime posts
It does have both AC and Heat on the thermostat. When I switch it to heat it shuts off. When witched to AC, I try to dial up the temp it doesnt shut off. Nothing works when switched to heat. So if I dialed it down nothing happens. It keeps running. All I know about the thermostat is that its a Hunter 40035A-350. Not sure if that helps. It looks cheap to me. Im not sure what the model of the Ducane system is. I will try to find it.

MistressEll

05:32AM | 07/29/07
Member Since: 01/30/05
360 lifetime posts
Obviously you have some issues here, first I suspect wiring errors, assuming you have a correctly compatible thermostat; secondly that there are settings/adjustments that must be made for voltage compatibility, again assuming you've purchased a compatible thermostat.

It sounds as though you haven't consulted the wiring diagram nor the instructions/specifications information packaged with the thermostat to begin with.

It sounds as though you are in totally over your skill-set, since you have been unable to provide even the most basic information to make it possible to BEGIN to suggest a diagnositc path.

Consult a HVAC professional for an in-home visit. Be prepared to be purchasing a new thermostat directly from this individual, as well as his/her time to diagnose the relay, sensor, limit switches, wiring, etc. and install/repair/correct your previous efforts.

Of course there is the obvious, perhaps the set-back temperatures aren't yet being reached with-in the +/- parameters of the thermostat and/or you are making changes expecting instantaneous responses and that's just not how most systems respond.

dlbrad77

08:08PM | 07/29/07
Member Since: 07/26/07
9 lifetime posts
First off I didn't install it so I don't know if it's the right one or not. And sorry for at least trying to fix it myself. I am a 10 year veteran of the Air Force and performed heavy maintenace on fighter aircraft so I tend to try to fix things like this myself. Sorry if thermostats and AC units are not my speciality. I came here for help, not criticism.

dlbrad77

08:12PM | 07/29/07
Member Since: 07/26/07
9 lifetime posts
Thanks Kestenholtz, I will look for that info and see what I come up with. I tried to look at the furnace and could'nt find anything. I can't even get the front panel off. You don't understand the condition of this house I moved into. Haha.

dlbrad77

06:20AM | 07/30/07
Member Since: 07/26/07
9 lifetime posts
I wasn't an electrician on them. I was a crew chief. I didn't mess with any wires my friend. As far as I can see, everything looks wired correctly. I have been doing research all over the web for wiring diagrams and so forth. The door on the front of the system will not come off. I understand that it raises an inch and pulls out, but it won't and being a rental house im not going to trash the panel. Ya know I will just have someone come and look at it. I know the outside unit is an AC10B24. The only thing I did to the wiring is tidy it up at the thermostat. THe guy who put it on left so much wire hanging out so I cleaned them up and put them back in the same position they were in. It was then when I switched from auto to on that it started shutting off. Once again the fans (both outside and inside) will not turn off at all. The AC will, but not the fans. How would you feel if you were asking me how to install landing gear in an aircraft and all I did was criticize you for being out of your league and not knowing what you doing and not having all the facts. Whatever happened to common courtesy and patience? I understand you guys are the experts and im not. I figured my descriptions gave enough info. Sorry. I will go elsewhere. Thanks

Handyman

07:41AM | 07/30/07
Member Since: 11/18/98
187 lifetime posts
First I have to say. These experts are helping you for free. I am in Orlando where it is relatively inexpensive to live and it costs me 80 bucks for an HVAC tech to walk in the door before they do anything.

On my thermostat I have a setting for the fan and the a/c. Both have to be set to auto for them to work in tandem.
Fan can be set to on or auto.

That said in reading most of the back and forth but not all it sounds as if the unit was working prior to you cleaning up the wires on the back of the thermostat and not after.

(Turn off the power)

Then I personally would go back to the thermostat and take it off the wall.

Inspect all the wires and connections maybe a piece of exposed wire is touching another one when it is pushed into the box or maybe it is grounding itself on the box.

A small short can stop the unit.

Also check your breakers. You may hove more than one that could have been tripped.

Good luck on this. And if you do call a pro let us know what they said so the answer will be here for future visitors.

dlbrad77

12:52PM | 07/30/07
Member Since: 07/26/07
9 lifetime posts
First off I didn't come here to argue. I actually hate forums for the sole reason of jerks being on them. I didn't have anything to do with this system. I did not install the thermostat. The only thing I did was clean up the wires and after that the system would shut off when switched to ON. I will see if they are touching or anything to that degree. Thank you, that was good advice. All I wanted was some straight forward simple troubleshooting advice. Im not an electrician so I don't know whether or not if the thermostat is compatible or not. Sorry. After some banging I got the model number of the furnace. Its MPGA075B3A. Im sorry, but when people get on here and start assuming that I installed all of this stuff and that I messed it all up and start saying things like im over my head and start assuming that I know what they are talking about when it comes to electrician lingo, I got upset. I know these guys are free, but they need to understand that we who seek help are not familiar with these sort of things and thus just require some lamen's terms explanation. I mean look at the post by Mistress. Come on! If you still would like to help I would appreciate it. If not I will go elsewhere.

MistressEll

08:57AM | 07/31/07
Member Since: 01/30/05
360 lifetime posts
IMHO the only "jerk" on this string has been the original poster.

1) Its a rental, well, were we supposed to just know that huh?

2) It worked FINE before you messed with the wiring to "clean it up". Notice you didn't indicate what the wiring was (telephone cable, proper HVAC cable, line voltage cable....).

3) Now it doesn't work.

Conclusion: you screwed something up in your efforts to "clean up the wiring". Likely on the air-handler fan relay side, but you might have pulled, broken, pinched, damaged something anywhere in between.

4) Again, its a rental, and you started messing with the wiring. Likely this was the home OWNER's (your landlord's) area of responsibility, and now you've messed something up, messing around in an area where you now indicate you have no knowledge, skill, training in.

5) You display anger, outrage, and become insultive when you are asked to provide even the MOST BASIC information about your situation, AND initially and througout this "conversation" continue to WITHHOLD the most basic of information...Refuse and provide excuses why this information will not be forthcoming, and scowl at the HELPFUL information that was provided to you. You continue to be ambiguous and withholding of even the basic and historical fact set, then start INSULTING those who attempted to assist you.

Contact the property owner and FESS UP to your egregious and erroneous activities. ASK THE LANDLORD WHOM HE/SHE PREFERS work on HIS/HER HVAC system. Call THAT HVAC PROFESSIONAL and make an appointment - BE PREPARED TO PAY FOR THEM TO PROFESSIONALLY DIAGNOSE AND CORRECT the situation that you created. For all you know the property owner may have had a maintenance contract that you might have voided due to your activites - SHAME ON YOU. Finally, stop screwing up someone else's property investment.

Worked fine till you messed with it. Not your property you are a renter - you shouldn't have messed with it in the first place. This latest information says it all, and explains much about just WHO THE JERK here IS.

MistressEll

09:05AM | 07/31/07
Member Since: 01/30/05
360 lifetime posts
First you say the problem evidenced itself immediately upon installation of new thermostat, YET you indicate it NEEDED a new thermostat, yet don't say what was wrong with OLD thermostat.

Then later, you tell us that the NEW thermostat worked fine, UNTILL post-install by a HVAC or other party, YOU MESSED with the wiring down by the furnace.

Seems OBVIOUS where/when the problem was created - YOUR HAVING MESSED with the wiring.

Then you tell us this isn't YOUR home, you are a recent RENTER, AND you have NO EXPERIENCE OR SKILLS in this area, no qualifications whatsoever, and can't even be BOTHERED to gather information now that you are looking for help (and obviously couldn't be bothered to acquire even the most basic of information before you began MESSING with the wiring!!!!).

Call the Landlord and/or the HVAC person who installed the thermostat and be prepared to PAY for them to fix the MESS you created.

dlbrad77

03:27PM | 07/31/07
Member Since: 07/26/07
9 lifetime posts
Look,

For one thing this is not my mess Mistress. I moved into this house a week ago. It had no thermostat!! Some people working on the locks said they could put one in. Well they did and guess what the problems started then!! All I did was check the wiring to see if everything look right. I didn't really have anything to go by so all I did was clean up the wires that THEY connected to the thermostat!! Why?? Because they had an inch of wire hanging out from each terminal that connected the wires to the thermostat. The problems were there from the second they (not me) installed the thermostat!! Once again the fans will not shut off (outside or inside)when switched to auto. I have given an ample amount of time for it to kick in once I set the temp. Nothing happens. It stays on. The only thing that changed after I cleaned the wires up was the fact that it shuts off when switched to ON from Auto. I did not go switching wires around or anything. I have never messed with any wires near the furnace. I never said anything about a new thermostat that worked fine. Ther was no thermostat on the wall when I moved in. I also never said that I couldn't be bothered getting the information. I just didn't want to damage the furnace panel. SORRY. But as you will see I was able to get the info. All I have to say is whatever!! Kesterholtz!! I know where you are coming from. It was no different in my old job. A far as not touching it because it is a rental...well you don't know my landlord. They would rather me try to fix than having someone come out and do it. They are cheap.

dlbrad77

06:25PM | 07/31/07
Member Since: 07/26/07
9 lifetime posts
Im done with this.

BV009957

06:55PM | 01/01/16
I know this is old, but if anyone else is searching and finds this, you might have a stuck relay. Flip the breaker in your house that controls the blower for the system (the fan will stop) and leave it off for 20 minutes the turn it back on, fan will turn back to normal thermostat controlled operation. Let's be nice and be patient on the forums guys

BV009957

06:59PM | 01/01/16
I know this is old, but if anyone else is searching and finds this, you might have a stuck relay. Flip the breaker in your house that controls the blower for the system (the fan will stop) and leave it off for 20 minutes the turn it back on, fan will turn back to normal thermostat controlled operation. Let's be nice and be patient on the forums guys

You might have to replace the fan control relay on your blower, but that is cheap, consult youtube for instructions.



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply choose button

Anonymous

Post new button or Login button
Register