Question about Shaw Electrical Supplies
How do I change temperature of the thermostat? Because I accidentally locked at 70 degrees. Only to cool, the up button no reaction. Can't find "auto" button.
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Posted on Jan 02, 2017
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...
Posted on Feb 16, 2010
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.
Posted on Mar 06, 2010
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.
Posted on Jul 07, 2010
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