Thermostat flashing "Cool On"

Thermostat flashing “Cool On”-Honeywell Troubleshooting

1. Honeywell Thermostat flashing cool on

The “Cool on”  message on a Honeywell thermostat is also known as “delay mode”. It often flashes in the form of a blinking snowflake  or as the word “wait’ as well.

It’s a courtesy message to let you know that the AC will delay in coming on for approximately 5 minutes in order to protect your unit from short cycling which can cause damage.

Honeywell thermostat says waiting for equipment

The waiting for equipment message on a Honeywell thermostat is to let you know that there will be a short delay before the AC powers on to prevent short cycling.

Honeywell thermostat says temporary

Whenever your Honeywell thermostat says temporary or temporary hold, it means that the temperature has been temporarily adjusted until the next scheduled change.

The “permanent hold” message indicates that the temperature is set at its permanent scheduled setting.

Honeywell thermostat says recovery

Recovery is a thermostat mode that indicates your air conditioner has turned back on after it has shut down because of a scheduled “off” period. The recovery mode message is nothing to worry about, it is simply a courtesy to let you know your AC has restarted in order to begin reaching the next scheduled temperature.

Honeywell thermostat says aux heat on

The Aux heat message on a Honeywell thermostat is to let you know that auxiliary heat has turned on in addition to your compressor as a supplement to get your temperature up.

It is a feature put in place to help your heat maintain temperature when the outdoor temperature is extra cold.

honeywell thermostat not turning onHoneywell thermostat “Return” blinking

The word “Return” flashing on a Honeywell thermostat simply means that the thermostat is returning to the preset schedule that it has been programmed for.

Honeywell thermostat says low battery with new batteries

According to Honeywell, if you are still getting a low battery message or the word Lol appears on screen even after you have replaced the batteries,
Then take the batteries out and replace them in the opposite , completely backwards position.
Leave the batteries in the thermostat backwards for about 30 seconds.
Take them back out and put them in the right way.

The message should be gone.

If that doesn’t work, there’s responsibility that the batteries are not good. Retry with new batteries.

Honeywell thermostat says ” leave”

Leave is the message on the Honeywell thermostat is the setting that you put your thermostat on when you are going to be away.
In other words, you’re going to be leaving for a while so you leave your thermostat on a lower or higher number based on the season so that it is not running at full capacity the entire time you’re gone.
Or it could be that it’s just sick of your face.

Honeywell thermostat blinking heat on

Heat on is the message on a Honeywell thermostat that is letting you know that there will be about a 5-minute delay before the heat comes on after the thermostat has been set.

The reason for this is to protect the equipment from short cycling and doing damage to the compressor.

This is the same message that appears when the AC comes on, except when the AC comes on the message will read “Cool on” or show a symbol of a snowflake.

Either way, there is nothing to worry about. It is simply a courtesy to let you know that there is a small delay between setting your thermostat and it coming on.

Honeywell thermostat is blank with no display

If your Honeywell thermostat is blank, the most likely issue is that the batteries have died. If you’re thermostat does not have batteries, then you have probably thrown a breaker.
Simple fix. Check the breaker first. If it is not tripped, then switch out the batteries.

Thermostat flashing _Cool On_ - HoneywellHoneywell thermostat reading wrong temperature.

The temperature sensor on a Honeywell thermostat is the most likely culprit win the thermostat is reading the wrong temperature.

Dust inside of the thermostat can accumulate on the sensor and cause it to gauge the temperature accurately. Popping the thermostat open and blowing out the dust with a can of keyboard air may solve the problem.

Another issue that can cause a Honeywell thermostat to read the wrong temperature is that it is not level.
Check to see if the thermostat has been knocked out of place and is sitting crooked.
If it is, simply level it back out and the thermostat should be reading the right temperature again.

3.  Another scenario that can cause your Honeywell thermostat to read the wrong temperature is its placement inside of your home. If it is not centered correctly inside of the area then it will not read the whole room accurately and could be affected by hot or cold spots in the room.

Honeywell thermostat not turning on

A Honeywell thermostat not turning on is usually a case of not getting power. If the batteries are completely dead, the thermostat will not turn on.
Also if the breaker is tripped, the thermostat will not be able to get power either.
A blank display, buttons not working, thermostat just not coming on, are all indicators that you need to check the battery or check and see if the breaker is tripped.

If the display is on but the thermostat is still not adjusting the temperature, then more than likely you have a dirty or malfunctioning sensor. Taking the thermostat apart and blowing out the dust can clear the sensor off and get the thermostat to working again. Or else replacing the thermostat is a little easier job than disassembling one.

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Dennis Reed

Dennis Reed Owner and Author @