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Furnance wont shut off when air conditoner is on, and we just replaced the thermostat

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Hi,
Either you have a bad wire or something is miss wired...

Thermostat Wiring and Terminal Designations
http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

heatman101

Posted on Aug 20, 2010

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Eb20b/ electric furnance/ blower wont shut-off after heat kicks out, got to kill breaker , runs all the time, installed new thermostat, no change?????? Its cold??????


Check the thermostat and make sure the fan switch is set on "Auto". If it is set on "ON" the blower will run constantly.

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My blower motor wont turn off in my furnance?


check the fan setting on your thermostat. On means always on, auto/int means only comes on during heating/cooling. if the thermostat is set to auto / int and the fan keeps running? you may have a bad fan relay switch. It may be integral on the primary control board of your unit.

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I have a Carrier furnance that is about 20 years old. I don't know the model or do I have a manual. The thermostat is a programmable Noma (model THM301M). When I set the the thermostat to hold a...


I would start by installing a new thermostat because it sounds to me like it's either the thermostat or the control board and the t-stat is the less expensive of the two. I hope this helps you and thanks.

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I have a RUUD Furnance with a piolet light. There


If you have a pilot, then this is an older furnace. Most of them use a 2 wire thermostat. Allot of the new digital, programmable thermostats require a 3rd wire - a common to the thermostat. Allot of old furnaces do not have a common terminal on the furnace board. It can be done, but takes a good technician. The way around this is to use a digital, programmable thermostat that will operate on straight battery. It will be stated on the thermostat package, saying it will operate with a common wire from the furnace or with only the use of the batteries.
Then make sure that you hook up the 2 wires to the "R" terminal and one wire to the "W" terminal, it doesn't matter which thermostat wire goes to which terminal.
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Sincerely,
Good Luck,
Paul Gibson

Mar 31, 2010 | Heating & Cooling

1 Answer

RUUD Air Conditioner not turning on


Need to check the breaker to the unit at the electrical breaker box. You should have a dual 60 amp breaker that runs the unit. Also if you removed the front of the furnance on the inside the system will not work unless the front of the furnance is on. There is a safety switch that will not allow the system to run with the door off. There could be the problem if the breaker is on and electricity is supplied to the unit that switch may be out and need replacing. The furnance is operated on 110 volts the condensor (outside section) operates on 240v you need to insure that the proper voltage is supplied to both.
Since both units work together yet operate seperately if the furnance comes on and the condensor doesn't then there is an electrical problem at the condensor (more than likely the contactor switch) if the condensor comes on and not the furnance then there to is an electrical problem (either 110 volts not supplied) or the switch to the safety cut off is bad. Now if neither furnance nor condensor comes on there could be improper power to both or a bad thermostat since the thermostat activates both furnance and condensor. Good Luck on repairs

Dave

Sep 04, 2009 | Ruud UBHC Air Conditioner

1 Answer

Thermostat takes too long to cool down 1 degree


Thermostats don't cool or heat. They are just the control device that tells the furnance or AC to operate and register the present temperature and tell the furnance or A/C to shut off, once the desired temperature has been reached.

Most programmable thermostats will take at least 1-2 weeks to "learn" how long to run the furnance or A/C in order to reach the desired temperatures you've programmed into it, for the time you want it be that temperature. Variables such as extremely hot days and higher humidity will also affect your cooling system.

Give it a little time to self-learn and it should adjust itself after a week or two of operation. You might want to take some time to review and familiarize yourself with the owners manual to see what Hunter advises for setting up and using the thermostat.

You may need to have your A/C checked to see if you're running low on freon, or need to have the coils cleaned, need to change the air filter, etc.

Hope this helps and best regards!

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2 Answers

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check your thermostat first to see if it may need batteries (some of the newer types of thermostats requir batteries to work properly, These are the digital types) If there isn't any problems there then check the electrical panel to see if there is a breaker for the furnance and if it has been tripped. If not, go to the furnance closet and check to see if the unit is plugged into the electrical service for the furnance, if it is plugged in I would suggest checking to insure you have the correct voltage comintg into the system. If so and you do have correct voltage coming into the furnance then you have a bad blower motor or blower motor capacitor. The capacitor can be checked with a meter that checks capacitors I would have this checked first and then the motor However if you have to replace the motor at that time I would replace the capacitor. Good Luck hope this helps


Dave

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Carrier furnance keeps running


check for open limit switch, their are multiple, check return air filter.

Dec 17, 2008 | Heating & Cooling

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Indoor fan motor continue to run even if the thermostat is in auto position with the cool and heat switch in the off position. The furnance don't have a fan on and off switch in the furnance like most....


Try this, disconnect the fanwire (green) on the furnace, if it shuts off then the hot wire from the thermostat is touching the green wire or bad thermostat. Thank-you-very-much!

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