cgp10019 Loc: New York City

Good Morning Swede:

Set your thermostat to AUTO. That will turn On and Off the fan.

singleviking Loc: Lake Sebu Eco Park, Philippines

Swede,

Post a photo of the thermostat so we can understand what model it is. I gather that this is a central heating/AC system.
Most thermostats have settings for HEAT/COOL, FAN AUTO/FAN ON, setting for the desired TEMP, and actual ROOM TEMP.

Some systems do not have all of these options however. It helps to see what yours looks like.

Suggestion:
You can always go to a LOWE's or HOME DEPOT with the photo of your thermostat and ask to read the instructions they have with a similar model they have in stock. Just make sure it's for your system. There's 2 different systems now for central home systems. One is for Central AIR/Heat pump systems using a single thermostat and the other is used for separate heating and AC systems. The wiring is different for each. A good tech will know which is which by the photo.

You can always just replace the thermostat to one you can buy at LOWE's or HD. Ask for one that has a circulating fan control switch. Honeywell is a good manufacturer and they make numerous models to cover all types of systems.

Some of these new GIZMO thermostats are all digital and you need to be an engineer to understand them and use them when you don't have the installation and use guide that comes with the thermostat. These installers typically throw these instructions away and don't hand them over for the home owner or renter as a usage guide.

GO FIGURE.

Post the photo and someone here can get back to you.

Bird Dawg Loc: Georgia

The Tstat has 2 settings- ON or Auto... ON runs all the time, Auto cycles with the compressor. ( some run a minute or two after compressor is Off).
Or it could be wired wrong.

Manglesphoto Loc: 70 miles south of St.Louis

Its normal for the fan to stay running even if after the unit has shut off, keeps the air circulating , however on most thermostats there is a setting for the fan to shut off with the unit.

jerryc41 Loc: Catskill Mts of NY

Having the fan run, rather than the compressor, is a good thing. Of course, if you start sweating before the compressor turns back on, then you have a problem. The manufacturer has to decide on a temperature range for running the compressor and the fan. If the A/C is on, the fan will be running, whether the compressor is running or not.

Don

swede, Central A/C fan turns on and off.

Ductless units wall hung or ceiling hung in A/C fan runs constant, in heating mode fan is off and on.

Bobbee

Is it on AUTO?

singleviking Loc: Lake Sebu Eco Park, Philippines

Guys,
There's a lot more info that's needed from Swede to troubleshoot his problem. We need to know if he has a separate heating system and central A/C system. Many older homes have base board hot water heating as well as central forced air A/C systems. Other homes have ducting for both systems for forced air but still have an oil fired heater and an attached central A/C unit and condenser coil. For these systems, there could be a switch in the thermostat for HEAT/COOL as well as a fan control switch for FAN ON/AUTO.

These systems require different types of thermostats and sometimes even separate individual thermostats to run them.

This is why I asked for Swede to post a photo of his thermostat.

johnst1001a Loc: West Chester, Ohio

They above mentioned Carrier. I have had a Carrier system since last Fall, with the A.C. unit charged this Spring. The system is their 21 SEER rated system, and has a two speed fan. After the compressor shuts off, the fan does runs for a minute or two on slow speed, but then shuts down. Interestingly, and maybe related, I was talking to the installer as he was wiring up the unit. He asked me how I wanted to have the system operate. My choices were, like a traditional unit, meaning fan comes on and shuts off with the compressor, or two speed, again with the compressor, or two speed delayed shut off, or fan runs continuously. I chose the third option, but the last option, compressor runs continuously option may mean your installed wired it up to run continuously, in essence putting a jumper wire in to bypass the switch on your thermostat for auto/fan. Someone mentioned the green wire, which is true.
I have a Nest thermostat, and it has a fan run feature which can be set for the time of day, duration, or auto. If you have a fancier thermostat unit, be it a Nest or the high end model thermostat from Carrier, you too may have the fan set on a schedule to run, and not even know it.
As for the Carrier unit itself, I love it. Does a much better job than my old unit, installed in 1988.

Papa Joe Loc: Midwest U.S.

Our thermostat has a switch giving us the option to have fan on all the time, or on 'auto' where it will cycle on/off. Possibly yours does too?

Swede Loc: Trail, BC Canada

Okay singleviking (didn't know there was such a thing HUMMMM) It's a Carrier if that helps. Thanks for everyone's help, suppose to get in triple digits for the weekend-I hate it


:lol: Swede

Swede Loc: Trail, BC Canada

Okay singleviking (didn't know there was such a thing HUMMMM) It's a Carrier if that helps. Thanks for everyone's help, suppose to get in triple digits for the weekend-I hate it


:lol: Swede

egw45911

Move the fan switch to "auto". It sounds like it in on "on".

singleviking Loc: Lake Sebu Eco Park, Philippines

Ok, It looks like you have a small switch in the upper right hand side that controls the fan and another switch below it for changing from HEAT to COOL. If the unit is wired correctly, then your compressor should shut off when the proper temp is attained but your fan can either be set to stay on continuously or go off a few moments after the compressor shuts off. That's called "AUTO". These switches should be small slide switches and go either "up" or "down" and there should be a change in the indicated display.
This model thermostat also has a schedule that needs to be set for times of day and temp settings. You'll need to go through the whole week's menu to set all of the temps and times to your liking. There's also a "MANUAL" override switch so you can bypass the scheduler portion and set temp manually.

One thing to keep in mind is that some thermostats have a 9 volt or disk battery backup in case there's a power failure, This type will retain your settings even when power is out. The other kind runs on the 18 volt transformer in your air handler and they lose all of their setting after a few minutes of power failure and need to be completely reset from scratch every time household AC power is out.

Carrier doesn't make their own thermostats and it's probably a Honeywell unit but Carrier put it's name on the front.

However, if your outside compressor never shuts off, then they have wired the thermostat wrong. You might get the wiring diagram from the Carrier website on the internet or go to your local Hd or LOWE's and ask about wiring diagrams for your thermostat. They come in the box and they should be able to make a photocopy of it for you...or call the home owner and tell him to get the thermostat wired correctly. Running the compressor continuously will drive your electric bill sky high.

If it's just the fan circulating air continuously, this is your choice and the fan switch placed in AUTO will solve your problem. I can't tell if your circulating fan has multiple speeds from this photo but most mid range units only have a single speed.

jeep_daddy Loc: Prescott AZ