Question about Honeywell Programmable Thermostat Heater

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Flashing snowflake on display

I have a honeywell RTH230b and sometime I get a flashing snowflake on the display causing the unit not to work. This goes out after a while and the unit comes on. What is causing this?

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  • 340 Answers

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

Posted on Jun 17, 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

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What is the RTH230B snowflake indicate?


means it is running in the cooling mode a flame means heating

Sep 03, 2014 | Honeywell RTH230B 5-2 Day Programmable...

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

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On my honeywell rth230b thermostat, sometimes when i try to turn on the a/c, the snowflake will just blink and the a/c will not kick on. why does it do that?


They do that sometimes as a timing feature when going from heat setting the to cool setting or vise/versa. It should not do that when the thermostat is off and then you switch it to cool. Make sure the batteries in the thermostat are fresh. And make sure the thermostat is fully seated on the housing. Also check the wires are fully inserted into the connections on the thermostat housing and the wiring is correct.

Sep 14, 2009 | Honeywell Electronic Programmable...

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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

RTH230B thermostat not working - nothing's happening


The 2nd combination is correct (w/ jumper). Wire nut or tape the blue wire. The snow flake shows it's going into cooling mode after a 5 min delay. If the AC is not coming on then the problem may not be the thermostat. If you don't have 24VAC between the red wire and the blue one the problem is at the furnace or it's supply. If you do, then check for 24VAC between the blue wire and Y on the thermostat(after the 5min delay) - if it's there the thermostat is calling for cooling. To check the heat, switch the thermostat to heat mode and use the W(instead of Y) on the thermostat(after the flame stops flashing).

Apr 02, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Rth230b honeywell display screen faint


Mike, The static electrical spark probably 'zapped' the Rth230b Honeywell Display unit. If you have already tried removing the power (batteries) from the unit and after waiting several minutes; reapply the power (batteries). If the problems remain unchanged, then it is time to replace the Display unit with a new one. The static electricity problem is problematic and the only way to prevent the same problem from recurring is to discharge yourself before touching the Honeywell Display. As you walk across the room which (probably has carpet), causes the static electricity to build up on your body and then discharges itself through the Display unit when you make contact with the Display unit. You might try coming to a complete stop and attempt to discharge the static charge on your body by touching the wall first with one hand for a second before touching the Display unit with the other hand. Naturally, cold weather with low humidity makes the static electricity worse. Hopes this helps you. Henry

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1 Answer

Honeywell rth230b thermostat doesn't work


On most Honeywell Digital T-stats there is a 5 min delay built in

Oct 23, 2008 | Honeywell Programmable Thermostat Heater

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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