Question about Shaw Robert RS-9420 Thermostat

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My 9420 thermostat also has two flashing flames when I put it on heat and two flashing snowflakes when I put it on cool. It won't turn on. Any suggestions?

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Flashing snowflake on ac no idea name of thermostat


Usually a flashing snowflake means you are in a time delay for cooling. If the snowflake becomes solid, cooling should start. If it never stops flashing, possibly it's bad. Turn power off to air handler, remove stat and put red green and yellow together and turn power back on. If indoor AND outdoor work and cooling begins the tstat is definitely bad.

Aug 18, 2017 | Heating & Cooling

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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.

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It probably has stopped outdoor unit and the blinking is to be done when working anamoni.afto heating and not to bring in cold air flashes the LIGHT as long heated air into the condenser.

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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

2 Answers

What do two snow flakes on the left side of the control display mean on a Robert Shaw 9420 thermostat?


The double snowflake means that the second stage cooling is on. (One snowflake indicates first stage cooling.) This gives a greater temperature change in extremely hot conditions with than you could get with a single cooling medium and drier air in your home.
From the patent: A two stage cooling system in which the first stage's cooling affect is transferred to the second stage through direct contact with an oil-like material. The oil-like material is cooled by direct contact with water which has been evaporatively cooled. The oil-like material is then utilized to cool the air stream prior to the second stage evaporative cooling. The use of an oil-like material in the first cooling stage of evaporative cooling allows a relatively dry air stream to be produced so as to fully capitalize upon the evaporative cooling affect of the second stage cooler.

The second stage comes on if your system hasn't reached the desired temperature at the thermostat within a programmed length of time (5 minutes is a usual setting). BTW: Your system also has two stage heating.

I hope this helps.

Cindy Wells

Jul 07, 2010 | Shaw Robert RS-9420 Thermostat

1 Answer

My Robertshaw 9420 thermostat keeps flashing, it won't let me set a temperature.


my robertshaw 9420 wont let me set a temp and two snowflakes are flashing

Dec 23, 2009 | Heating & Cooling

1 Answer

Flashing snowflake symbol and a/c is not blowing upstairs


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

Jul 20, 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

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