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Ac unit starts up intermitently and runs for a few minutes then shuts down.Light on circuit board is steady red.Thermostat goes blank.

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Sounds like you have a loose/broken 24volt wire. I would look at the wires comming off the transformer, the board, and the thermostat connections first.

Somewhere you are losing 24 volts. Obviosly the transformer is working, so you are just losing control voltage somewhere.

Check all connections at wirenuts, stackons, etc.

Posted on Sep 25, 2009

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Just installed Archtic King 5,000 btu window AC unit. It has no thermostat and runs all night long. Every few minutes the AC slows down like a brown out and the lights dim. Why would it brown out?


If the compressor is having a hard time starting it will "pull down" on the electricity causing it to sound slow. Your compressor is probably not starting and this will make it run all the time with no cooling. The air will feel cool but not cold. If it is a new unit take it back. If it is a used unit it may have a loose or disconnected wire, a weak capacitor, or damaged compressor/circuit board.

Jun 10, 2015 | Heating & Cooling

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At night its shuts down when the therm is satisfied,but trys to restart right away and when it does start it shuts down right away and just keeps doing this


The thermostat has a differential built into the temperature sensing operation. The differential is normally a degree or more. If the stat shuts down at 72 degrees it should not start the unit again until the temperature in the room reaches 73. If the AC runs and cools properly until it shuts down, I would check the thermostat. The AC can not restart immediately after it shuts off because the pressures in the system are too high at the compressor. It takes a few minutes for the pressures equalize allowing the compressor to start. If the stat tells the unit to start under high pressure, the compressor will shut down on overload. It will start and run after the pressure falls enough for the compressor motor to run.

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1 Answer

Honeywell Chronotherm iv Plus power cuts on and off


There's a trouble shooting guide here, you need to check for the presence of 24V when it goes blank, and trace back to where it's disappearing (I assume it is losing the 24v, if not you'll need to go through the installer setup or read on...
My first thought would be to check the wiring which has been touched last if it started doing that after you had coil replaced.
As an aside I'm not sure which model you have but if it has batteries you should replace them (I don't think it does have batteries but not seen a model iv so I'm unsure)

https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1410.pdf

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1 Answer

Coleman Rooftop AC fan stops after 7 or 8 minutes of running. Will turn on again after about 10 minutes on its own.


Remove green (fan run) wire from thermostat, and connect to red wire (power) and see if fan runs, and if it will stay running. That will by-pass thermostat to see if it is problem. If it continues to run, thermostat is problem. If that doesn't cure it, I'd remove cover up top and with power off at circuit breaker, blow compressed air in to motor air holes to make sure it's getting proper air for cooling, as well look for small plastic plug on housing where oil can be added ( few drops) to lubricate motor. Leave cover off and try fan to see if that may help. If at all possible, a clamp on amp meter will confirm if motor or relay is at fault if none of these suggestions help. If amp draw at motor too much, motor may be seizing when warmed up from running. test draw when first started and after running for amount of time that it usually quits, and if noticeable difference, motor is seizing and needs replace. You can also test amp draw at main 120v feed wiring with unit just in fan mode.

Sep 13, 2012 | Coleman Heating & Cooling

1 Answer

Ac unit runs, inside blower shuts off after 2 mins, compressor continues to run, t-stat still calling for cool


My central AC unit decided to stop on the hottest day of the year. It would start and run normally for a few minutes and then the blower would shut off. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. This was easy to get to and replace and my last hope before waiting for someone to come fix it. The capacitor cost $4.04 with tax and had my AC working again. Needless to say I was beyond happy. I hope this can help others with a similar problem.

May 20, 2012 | Heating & Cooling

1 Answer

Can dust build up on a picture tube's circuit board cause them to overheat and shut the tv down.


dust will not cause an issue like this in this type of set--RCA? it means a short of some type exists and the set shuts down or blanks the tubes--all you have described as far as appearance is normal.

RCA sets like this can be difficult to repair and also if you Google the model number you will see they have a lot of "problems".

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1 Answer

Power up unit and thermostat, circuit board and gas valve smokes. checked transformer and its output is 24vac. this happened after a thunderstorm. blower works manually from furnace but not @ thermostat....


You have a short circuit, which is obviously dangerous. Your blower motor is controlled via a 24VAC control circuit, but is 120VAC. The circuit board and gas valve are probably history, but it needs to be troubleshot to determine the scope of the damage.If you remove T stat you will see several colored wires. The red and green wire when touched together should cause your fan blower to run. If that works when you bypass t stat the t stat is gone. The red to white will open your gas valve on your heater. The red to the yellow or blue will start your AC compressor or condenser fan motor. Be careful with the yellow and blue wires as one is actually a neutral and one goes to the AC contractor on your condenser unit contractor. Hope this helps!

Aug 02, 2011 | Heating & Cooling

4 Answers

Forced air heater lites but blower run a few minutes and shuts down. Service board blinks seven times. don't have manual


Watch The Unit's Ignition Process See If The Unit Is Getting Fire Most Likely It Needs A New Thermostat. The Thermostat If Bad Will Cause The Unit To Turn On Ignite But Will Not Detect The Heat From The Flame And Then Shut Off The Gas To Protect The Home From Carbon Dioxide.
If The Unit Fails To Light At All Check The Igniter.
I Hope This Helps,
Sincerely,
Michael Scott

Mar 12, 2009 | Heating & Cooling

1 Answer

I have a Carrier 38tra048340 ac 4 ton unit outside, heater in attic. Thermostat is Totaline P374-1100. Power went out than back on after a few hours due to vehicle crashing into power pole. AC was running...


Blank screen sounds like a fried thermosat. Abrupt outages can affect certain types of thermostats. Make a jumper wire and jump across R and G. See if you get any action from anywhere. If a fan or compressor kicks in you know you have a burned out thermosat...

Jun 23, 2008 | Carrier Heating & Cooling

1 Answer

Intermittent Power Problem when playing CDs


Hello db1964,

I have a cdf-e75 that had a similar problem, although the red power light was dim for all functions. (the radio, tape and cd)
After opening up the unit and inspecting, I found one of the pins on the printed circuit board for the power had broken away from the solder. (it is a tiny board where the AC connector is soldered to) Seems in my unit there is nothing securing the molded AC connecter to the plastic case except the the printed circuit board it is soldered to-It is a poor design; perhaps your is the same? I suspect over time pushing the AC cord into the back of the player may have broke the connection? Anyway, I soldered the connection and I have never had any additional problems as the unit has worked fine since.
Don't know if this helps, but my suggestion would be to open the unit and inspect the pin connections on the AC printed circuit board to see if any have a loose/broken connection. ( Mine was not noticible with the naked eye as I had to use a magnifying lens and a bright light. Hope this might help.

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