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Thermostat temp increases to selected temperature and clicks but fan doesn't stop running

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  • n15928 Apr 09, 2011

    How would I check the relay out. Do I need a multimeter? Continuity check?

  • n15928 Apr 09, 2011

    Robertshaw 9600

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If the system is less than 6 years old and if the thermostat is not set to "Fan", it may be telling you that there is an error code stored on a LED light on the control board. Look through a small viewing port on the heater near the bottom of the unit. Look for a blinking light. Now remove the front panel and look for a wiring diagram that will also have a diagnostic chart. Not knowing what you have for a system makes it harder to help you, if you could tell us the make and model, we can give you additional information.

Posted on Apr 09, 2011

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I understand that you are having a problem with your air conditioner system. The fan will not stop running when the thermostat reaches temperature. This is usually caused by the sensor in the thermostat that turn the fan on and off on automatic.

You can check you thermostat by doing the following.

1. Remove the cover on your thermostat.
2. Remove the wire attached to the contactor (screw) label G
3. If the fan turns off the thermostat is bad
4. If the fan does not shut off you have a bad fan relay or circuit board (do not know the model hard to tell which one it can be)

To replace the thermostat once you have purchased another one
1. Turn off breaker two the unit
2. Label all of the wire on your old thermostat
3. Mount your new thermostat
4. Replace the wires to the corresponding letters from the old thermostat
5. Turn unit on
6. Set temperature so that unit comes on (2 degrees cooler if in summer)
7. Wait for thermostat to reach temperature (usually 2 degrees higher or lower than set)
8. See if fan turns off

This should take care of your problem if it is the thermostat. If this does not work re-post to the thread and I will walk you threw so more trouble shooting steps. This is the first on you want to try.

Thank you for choosing FixYa.com

Justin

Posted on Apr 09, 2011

  • Justin Burnett
    Justin Burnett Apr 09, 2011

    Yes, you will need a multimeter to check the relay. Can you post the make and model of the unit that you have?

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If the fan is running non -stop then there is a short in wiring.The wiring is getting short. The thermostat wires needs to be disconnected and fan wires needs to be disconnected and rechecked.Mark the wires before disconnecting.The fan relay is getting stuck open.Its not getting close can also cause this.If the relay checks out short, then it has to be replaced.But first, the wirings needs to be checked.---------- This will help.Keep updated.Thanks.Helpmech.

Posted on Apr 09, 2011

  • raj somaiya Apr 09, 2011

    Yes relay has to be checked by meter.Also if it looks burnt or cracked from its body.Then it has to be replaced.--------- The thermostat is 24 V AC--Low Voltage Thermostat.so you can also check the thermostat volt to confirm.If relay fan and wirings al checked out ok, then its faulty thermostat.Its getting overheated and not cooling.So the fan runs non-stop to cool down the thermostat.Thanks.Helpmech.

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