Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Flashing snowflake symbol and a/c is not blowing upstairs

2 thermostats one downstairs and one up. the up is flashing snowflake and is not blowing.

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Flashing snowflake normally means it is in a time delay. give it five minutes and see if it continues.

Posted on Jul 21, 2009

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2 Answers

What does the snowflake mean on a Honeywell thermostat in cooling mode. Also had the problem in the heating mode.


The snowflake means it's cooling. If the outdoor unit is not running then the problem is likely outside.

May 21, 2017 | Honeywell Heating & Cooling

1 Answer

Air conditioning not working. Have White-Rodgers thermostat 1F79111, I think. Replaced batteries. Now have flashing signal like an asterisk. What does it mean?


Blinking snowflake means it's on time delay for cooling to come on (usually 5 minute time delay to prevent compressor short cycling). Solid snowflake means cooling is on

Aug 03, 2016 | White-Rodgers (Protech) White Rodgers...

1 Answer

Flashing snowflake


The flashing snowflake means it is in the cooling mode, but is waiting for itself to 'time out' after a call for cooling. It should be about a 5 minute delay then should come on automatically. At that poing, the flashing snowflake becomes steady.

Try it one more time and set the timer on your smart-phone to ten minutes before you touch it again. If that time elapses and no cooling and it is still flashing there's possibly a problem in the thermostat that will necissitate replacement.

Aug 02, 2014 | Honeywell Heating & Cooling

1 Answer

Snowflake symbol and filter message


That symbol usually means that the a/c unit inside the house has frozen over and it won't start working again until after the ice has melted. I would recommend hiring a repair guy for it though. I had this problem and even after it melted the a/c would still go wonky from time to time. There's a part that you might need replaced on the outside unit.

Apr 30, 2014 | Heating & Cooling

1 Answer

What does it mean when the snowflake flashes?


a flashing snowflake indicates a time delay in cooling and a flashing flame indicates heat delay and both are normal

Oct 08, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have 2 Thermostat's in my home. My heat works well upstairs but not downstairs. My thermostat downstairs won't come on but I unhooked the thermostat from downstairs and tried it upstairs and it worked...


Hi, sounds like you determined the problem is not with the thermostat. That leaves the furnace that serves downstairs. What type heating system do you have?

Jan 13, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Flashing snowflake on display


That is a Time delay normal to keep the condensing unit from turning of and on to fast really save the life of the equipment

Jun 16, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell thermostat display has flashing snowflake /ac not working


the flashing snowflake is it telling you its in % min delay if it doesnt stop flashing within 5min it may be a bad tstat. if it goes solid and the unit is still not working its probably not the stat

Jun 13, 2009 | Honeywell Electronic Programmable...

1 Answer

Heating blowing coo air downstairs and warm upstairs?


Some of this depends on where the air handler/furnace is located. Most often in two story houses, it's in the attic upstairs, or in a closet upstairs. A duct routes air from the furnace to the downstairs supply duct, so it is a distance from the air handler.
When the unit first initiates a heating cycle, that duct is going to be full of cool air, and the duct itself will be cool. So the furnace has to run long enough to push the cool air out, as well as warm the duct up, before your going to feel warm air at the registers downstairs.

Keep in mind, heat rises. And, your thermostat only monitors the immediate area where it's located. In your case, upstairs.
Two story houses are problematic because of this. And one way around it is to have a damper system installed that distributes the air upstairs or downstairs based on a thermostat located in those spaces. There would be 2 dampers, and 2 thermostats (one upstairs, one downstairs). Each stat would control a damper, and the call for heat or cooling.

Let me know if you would like to consider a system like this, and I can point you to components to use. I've put several system like this in.

Jan 26, 2009 | Kitchen Appliances - Others

2 Answers

My Honeywell rth230b thermostat continues to give me a flashing snowflake signal and will not allow the AC to turn on.


Your snowflake should flash for about five minutes, that is the time delay built into the thermostat. It should stop after that and your system should begin to function.

May 28, 2008 | Honeywell Heating & Cooling

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