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Traditional wall thermostat Thermostat Switch Setting Q&A-3
FAQs on Room Thermostat Switches

  • POST a QUESTION or COMMENT about switch settings on room wall thermostats, continuous fan operation, & low voltage transformer diagnosis & repair

FAQs on using room thermostat switches.

This article series explains the use, setting, and adjustment of the FAN On-Off and MAN-AUTO switches on room thermostats.

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Q&A #3 on Using the Switches on Room Thermostats

Thermostat COOL OFF HEAT settings explained

Recently-posted questions & answers about the settings of external switches on a room thermostat, posted originally at THERMOSTAT SWITCHES, EXTERNAL - we recommend a look through the switch information given there.

On 2019-06-18 19:40:16.975933 by (mod) -

In the ARTICLE INDEX you'll find an article titled blower fan won't stop that lists all of the causes for that problem. That would be a good place to start. Let me know if you have further questions and we'll take it from there.

On 2019-06-16 20:56:32.266483 by Anonymous

@Tom,
The switch is set to auto, the furnace and air are completely separate units not sharing anything but thermostat

On 2019-06-16 20:51:06.645228 by Tom

I have a motor home when I run the furnace the fan runs constantly and heat stops working same with air conditioner the only conection seems to be maybe bad thermostat am I right

On 2019-06-04 01:04:38.680686 by (mod) -

Anon

Normally you leave the fans switch set to Auto. That will cause the fan to run in response to a call for heating or cooling but otherwise to be off. If you set the fan switch to on on most thermostats the fan will run continuously. Some people do that for greater building Comfort or to increase air filtration. Of course your thermostat might be different. If you look in the ARTICLE INDEX above you find an article detailing the fan Auto on off switch and how to use it.

On 2019-06-03 04:16:42.683557 by Anonymous

Is the fan switch on the theromstat be on a off or on position

On 2019-05-28 01:02:31.586067 by (mod) -

If you mean air conditioning, and if the thermostat is the one controlling the air conditioner then I would not expect you to be getting cool air if the thermostat is off

On 2019-05-25 01:49:37.696629 by Catherine

Do you still get air in your apartment if the thermostat is switched off?

On 2019-05-04 02:48:39.604799 by (mod) -

Is it possible that in ON mode your fan runs continuously and that's preventing the coil from becoming blocked with ice and frost?

On 2019-05-04 02:06:31.735523 by Anonymous

Freezes up in auto mode fine in the on mode. Gassed up . Motor checked good


On 2019-03-13 09:55:31.583061 by Anonymous

I have a R-410A heat pump,is it normal for the fan to come on at the set Temp and shut off at set temp also?

On 2019-01-13 00:21:14.530866 by (mod) -

IF the outdoor unit isn't shutting off - ever - it's likely to be a control board or relay or sensor falure.

On 2019-01-12 15:02:15.146228 by Anonymous

Why is it that my heat pump will not shut off when it reaches room temp.

On 2018-12-03 19:14:07.237506 by (mod) -

Most likely there is a fan on switch that has been activated at the fan limit control, or there are shorted wires in the thermostat wiring, or incorrectly connected thermostat wires, or thermostat switch that is not set correctly, or as a last guest in the list a bad limit control switch.

On 2018-12-02 12:38:04.346127 by (mod) -

At CONTINUOUS BLOWER FAN OPERATION

https://inspectapedia.com/aircond/Blower_Fan_Continuous_On.php

we explain how at either the wall thermostat or at the switch in the air handler switches can be set to keep the blower fan on. Sometimes we want to do this for improved air filtration or more even temperature control in a building

On 2018-12-02 06:20:59.021830 by Anonymous

Why does the fan run on auto when all is off

On 2018-12-01 16:50:43.300140 by Gloria smith

Why does the fan run on auto when all is off

On 2018-12-01 16:48:35.877726 by Gloria smith

My fan keeps running on auto how to turn it off when cool and heat is off

On 2018-10-16 01:05:42.664844 by (mod) -

Let's start at the diagnostics at

https://inspectapedia.com/heat/Blower-Fan-Wont-Start.php

On 2018-10-15 17:14:19.776572 by Dave

My furnace blower wont come on.. worked great until I turned off the main breaker switch to find our cat that when down the room floor 4x12 vent. I also turned off the a/c breaker.. after finding the cat and removing.. it doesn't work.. no fan, no electronic igniter signal, no motor fan noise to suck any gas fumes out of the chem that usually happens when its working.


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THERMOSTAT SWITCH FAQs-3 at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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