Question about Shaw Robert RS-9420 Thermostat

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Air conditioner thermostat

My thermostat is stuck I can not get it to go up or down. It has 2 snowflakes flashing and does not turn itself off. It shows the current temp. and offset to 45.I have turned the box off outside. Nothing changed. The only way I can get it to turn off is to turn it off at the wall inside. Help please.

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Posted on Nov 06, 2013

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1 Answer

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.

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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.

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Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

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