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Robert Shaw thermostat 9400 set on 75 degrees but room temp says 79 so air just keeps on running. Air is coming out and does not feel like 79 degrees.

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  • Heating & Co... Master
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Sounds like the compressor isn't running. Probably needs a new capacitor in the outdoor unit.

Posted on May 16, 2017

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When set to heat it blows out cool air.


Chances are your portable unit is a reverse cycle unit...If so, the leaving air temp in heating mode is not usually much warmer than room temp with 85 degrees F just about the maximum under PERFECT design conditions. A small portable in a large cold room may only be discharging 75 degree air, which is going to feel cold.

If your unit is NOT a reverse cycle unit, the heating source (probably electric resistance) is either not coming on at all or a portion of it is not coming on due to a defective element, burnt wire or a control issue.

Jan 08, 2015 | Amcor AL10000EH Portable Air Conditioner

1 Answer

I don't know a good setting on a robertshaw 9420 thermostat, for really cold,and fast air condition.


Well Brian, an air conditioner creates the same temperature drop across the evaporator at any thermostat setpoint, so there is no setting that will get it really cold really fast. If your return air is 88 degrees (in a hot house where the system has been off) the supply air temp is going to be near 68 degrees..... as the a/c runs, the air changes within the structure cause a reduction in the average return air temperature and slowly drops the return to 87, then 86 then 85 etc, etc and the corresponding supply air temp continues to drop from 68 to 67 to 66 to 65 etc etc. Eventually the supply air temp after the appropriate 'air changes' within the structure will drop to 55 degrees and possibly even lower to satisfy the average room temp at 75, 74, 73 etc. to a point.

There are SOME newer a/cs that have two speed compressors that may effect the supply air temperature drop under differing load conditions, but thats a different ball of wax.

So, if you want it cold quickly you are out of luck, just leave the t-stat set at 70 degrees and pay the electric bill when it comes in.....

Dec 25, 2014 | Heating & Cooling

1 Answer

Display shows "cool ** " I have never noticed two


the issue is most likely not with the thermostat, set the temp down to 65 degrees and listen for a click at the thermostat (it may not make any sound). go outside where the condensor fan is and look to see if the fan is spinning. if it is then the thermostat is probably ok. If you still are not getting anycool air and just warm air pumping out you may need to have someonne come and check the coolant level in your system. It may just need a recharge, but if you have lost coolant there may be a leak in your system. Alll that being said, you may need a licensed professional to come out and check your system

Mar 23, 2011 | Shaw Robert RS-9420 Thermostat

2 Answers

What degree should I keep it on? 66 or 79? I can't find the manual


79 will mean that your house will be 79 degrees inside, I would think you would rather 75 or lower number. The lower the number the colder you want the room to get and the harder the AC will have to work for you.

Jul 07, 2010 | Fedders A6D24E7D Wall/Window Air...

2 Answers

AC Thermostat is set to 78 but wont cool past 79 or 80


If your unit is running 24/7 you are either low on charge or the unit is to small for your house.
A 20° temperature difference is about normal for the room air vs the air coming out of the ducts, but the room air and the leaving air should keep getting colder and colder.
An air conditioner should cycle approximately 3 maybe 4 times in an hour if it's properly sized.
As for the thermostat thermometer they are very cheap and are more for reference than actual temperature, so if 78° is not comfortable, then you should set it lower but not rely on thermostat being accurate or what the thermometer is saying as long as it is consistent.
The air conditioner and thermostat can also be set below 78°, there's a lot of people set them at 72° and below with no problems.
the only thing is if you have real low humidity you'll need to watch indoor coil or the suction line (the big line) on your outdoor unit and make sure it doesn't freeze up on you.

Sep 13, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

My air conditioner will kick on but will stay on and not


The thermostat is not functional, therefore its not cutting off the compressor once the room air gets cooled to the temp setting of the thermostat, also the refrigerant gas may have leaked out some but not the entire refrigerant gas(freon, CF4, etc.), keeping the compressor running contentiously to come down to the set temp..............sodeep

Aug 20, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

Tried resetting the thermostat. Shows 70 degrees for a second. Then back to 78.5 degrees. When I use the arrow adjust to change settings the number does not change


Depends on your Tstat. The set point is different from room temp. My tsat show set point and room temp. But to answer you when you set at 72 and room temp is 75 . It will go back to room temp till you reach that temp. Rusty

Jun 07, 2009 | Heating & Cooling

1 Answer

I have a comfort zone furnace. If it's 50 degrees in the house, and i set my thermostat to 70 or so,it takes at least 24 hours to reach 70 degrees. The furnace starts up and runs normally for about five...


When the thermostat calls for heat it should run until the room reaches the temperature setting then shut off. Is the blower motor running and can you feel air coming out of the vents? It sounds like the blower is either not running or putting out enough air to keep the furnace heating. The blower moves the heat from the heat exchanger to the room, if it can't remove enough heat from the heat exchanger there is a limit switch that will shut the burner off if it gets to hot and that's what it sounds like is happening.

Apr 25, 2009 | Heating & Cooling

1 Answer

Edgestar 12000 heating problem


bad thermostat. the stat can be as must as 5 degrees off. try, if possible testing the unit in a differeent location

Dec 24, 2007 | EdgeStar Portable Air Conditioner Heater

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