Question about Shaw Robert RS-9420 Thermostat

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

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OK is this a good or bad thing.

Posted on Jul 15, 2015

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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

Posted on Jul 07, 2010

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Robert Shaw 9620, replaced batteries. still shows lo batt. checked batteries are good. no other display but low battery


It sounds like the board is locked up. Try this...Take the battery out. Now, take off the red wire (or the one marked "+")
Wait 30 seconds. Reconnect the + Wire and then reinstall the battery.

Sometimes surges can lock up the board. The battery, by the way, doesn't do anything unless the power goes out, so they can last for years.

Jan 09, 2011 | Shaw Robert RS-9420 Thermostat

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Lost programingand instalation manuals


Here is a link to the complete user's manual for Shaw Robert RS-9420 Thermostat:
http://www.honeywell-thermostat.com/manuals/rs9420manual.pdf

Good luck and thank you for using FixYa! We would sure appreciate a 4 "thumbs-up" rating for this FREE answer. Happy holidays!

Dec 05, 2010 | Shaw Robert RS-9420 Thermostat

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Our Robert Shaw thermostat 9520 just went blank. Do you have any ideas, nothing is working?


Try replacing the batteries.

Remove the cover by using a coin or screwdriver to prise it off. Insert the coin at the left side between the backing plate and the the cover, and twist.

Romove old batteries and insert new ones.

Mar 06, 2010 | Shaw Robert RS-9420 Thermostat

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We had a reverse problem with our Robert Shaw thermostat we left the thermostat setting at 52 so the pipes wont freeze we wore gone for a week, when we got back the up-stairs wore over 100 the thermostat...


Same thing happened to mine, it was replaced and the new one did the same thing about a year later. Needless to say it was no longer under warranty, which is no problem as I will not have another Robertshaw 9420 installed in my home. Very dangerous, especially if you are not home and it goes up to 99 or higher...

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Jun 30, 2009 | Shaw Robert RS-9420 Thermostat

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Robert Shaw thermostat suddenly went blank


Best solution GET RID IT BEFORE IT'S TOO LATE....Original 9420 installed 8-18-06 changed temperature by itself and would not allow any adjustments...this one replaced on 1-3-08 and this one is doing same thing. Heat set on 70 when I noticed it getting extremely hot I checked thermostat and it was on 99 and would not allow me to adjust. Switched to off position waited 25 minutes and cut back on to heat....still will not allow me to adjust down from 99.....THIS PIECE OF **** WILL BE REPLACED TOMORROW WITH ANOTHER TYPE OF THERMOSTAT.

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