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My Robertshaw thermostat went blank and will not reset. My central cooling is not coming on as it should. Is this the thermostat or the compresser. When the compresser comes on, It does cool.

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4 Suggested Answers

  • 74 Answers

SOURCE: central air conditioner doesn't cool

A central air conditioner that runs but doesn't cool may just need to be cleaned. Plan to do this on a relatively warm day. First look for your owner's manual and, if you can find it, follow its instructions. If you can't find it, request one from the manufacturer (see Resources). To clean the filter, remove it from the furnace or air handler (it?s usually located inside or very near the air inlet side). Replace a disposable filter or clean a reusable filter according to the manufacturer?s directions. 1) Before you begin, check the thermostat to make sure it is set to "cool" rather than "heat." Then turn off the power to the unit; there is normally a shut-off or disconnect panel on the house wall next to the outdoor compressor. Otherwise, shut off the air conditioner's 240-volt circuit at the main electrical panel. 2) Rake leaves and debris away from the outdoor condenser. 3) Remove any protective grille or cover from the condenser's fins. 4) Use a soft brush to clean dirt and debris from the fins, then vacuum them with a brush attachment (be careful not to bend or damage them). If you accidentally bend fins, you can buy a comb made for straightening them at an appliance parts store. 5) Unscrew and lift the top grille off the unit, if possible. If the fan is attached to the grille, be careful not to pull any wires loose. 6) From inside the unit, hose out the fins (protect the wiring and motor with plastic). If your owner's manual calls for lubricating the motor, do that now--don't over-lubricate. 7) Then reassemble the unit. 8) To test it, turn the power on and set the thermostat to turn the unit on. Let it run for a few minutes, then feel the two pipes that connect to the condenser unit (slide any insulation back). One should feel warm, the other cool. Otherwise, call an air conditioning technician--the refrigerant may need to be recharged. NOTE: Avoid straining an air conditioner's compressor by waiting at least five minutes between turning it off at the thermostat and turning it back on. Air conditioner or heat pump still giving you trouble? To Home Problem Solver Main Page Copyright. All rights reserved. Interested in licensing this DIY Content? Related terms: what to do if, how to fix, troubleshooting, DIY, air conditioner doesn't cool, air conditioner too warm, warm air from air conditioner, air conditioner not cold enough, how to clean air conditioner, cleaning air conditioner, air conditioner cleaning

Posted on Jan 18, 2006

  • 230 Answers

SOURCE: my goodman central a/c unit

My gut tells me that the indoor fan relay,24volt fuse or circuit board have gone bad, but first lets eliminate the thermostat as a problem.
1) Turn off the air handler at the disconnect switch to shut off 24v.
2) Disconnect the 24v wires from the thermostat.
3) Only connect the "R" and the "G" wires together. (Usually red and green)
4) Restore power to the air handler.

Does the fan come on? If it does than the thermostat is bad. If it does not come on then we will look closer at the other componants. Give it a shot!

Posted on Jul 09, 2008

  • 958 Answers

SOURCE: RobertShaw Thermostat 9600 problem

verify if you have separate units for each floor.

the ones working could be a complete separate unit from the one having problem.

look at the condensing units you got outside , how many are there?
if you have 3 units outside and you have 3 thermostats, then each thermostat is controlling individual split units.

we have to concentrate on the one that is not cooling. give me the details on what is going on with problematic one.

is the outside unit running?
is the outside fan running?
can you distinguished if the compressor is running the same time as the fan?

tnx 4 using fixya,

drcool

Posted on Sep 14, 2008

kingbrizzle
  • 407 Answers

SOURCE: Carrrier Central heat and air. Model 38CKC042300,

Unfortunately no, this is one of three things.
1. Compressor is worn and is starting to pull to many amps to operate. Can possibly be fixed by putting a hard start kit on the unit, but will have to be done by a technician.
2. Compressor has an internal short and will have to be replaced.
3. Fuses bad or under sized. Max fuse size is stated on information plate on outside unit.

Sorry to hear about your troubles and hope you can get it fixed soon!

Posted on Aug 15, 2010

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Here's how I fixed my Robertshaw thermostat that was stuck at a 70 degree reading for almost 2 monthes. When I turned on the air conditioner or heater it wouldn't stay on. I removed the cover panel and dusted off the inside which the guy at local hardware store suggested. That didn't work. Then I noticed the words "reset" right on the green circuit board on the left side. There's a very small silver button. I pressed on it and everything reset. Less than a minute later the thermostat is reading the correct room temperature. Now my air conditioner and heater are working properly.

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I have a robertshaw 9420 and the screen is blank it takes no batteries and the reset button has no effect. the manual is of no assistance what so ever


Hi,
You are not getting the 24v power from the furnace...
Either the furnace power is off... the 24v transformer went bad...
or there is a fuse that blew which is interupting the 24v power from the trnasformer...

The blank screen in other words is an indication of amuch larger problem...
you need to find that power problem and fix it...


ere is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101

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check with the company u brought it from and check if you have not put the correct conector to the right temals on the back of the switch.

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