Question about Quasar HQ2051TH Air Conditioner

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Is there a fuse or reset?

My AC doesn't run at all. There is power at the outlet, but even the fan doesn't run. I can hear the thermostat click, but nothing else. Is there a reset or a fuse?

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Checkout the co. webpage under troubleshooting the model #.

Posted on Sep 01, 2008

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3 Answers

How do I get my AC running again? Ruud UBHC AC unit isn't running. Started yesterday or today.


Sounds like there is no control voltage. Either the transformer to reduce the voltage from 110 volts to 24 volts is not producing the 24 volts needed for control voltage, or most furnaces have a small 3 or 5 amp fuse mounted on the main control circuit board that may be blown. Other "outside circumstances" may involve a break in the thermostat wire...more than likely the red wire if you are getting nothing to work. I have seen evidence of "critters" that have chewed through the low voltage thermostat wiring that would keep the thermostat from controlling anything. To check this, go to the furnace and jumper the red & green wire to get the fan running just to isolate if it is a thermostat wiring severred. Good Luck.

Dec 11, 2014 | Ruud UBHC Air Conditioner

2 Answers

Doesn't power up, test and reset buttons don't help. Using heavy duty extension cord,does it have to be plugged inj directly?


First, you want to make sure that you have power at the plug that you are using for your air conditioner. You can test it with a voltage meter or simply plug something else into the same outlet (if the receptacle is 220V, you will need to measure it with a voltage meter). If it works, you know you have power to the air conditioner. If it doesn't work, you'll need to check your fuse panel for any blown fuses or your circuit breaker box for any tripped circuit breakers.

Air Conditioner Control

If you have power, it could be one of several problems that are keeping it from running. Many times an air conditioner can't start the compressor if the amperage or voltage is too low. This can happen, especially if you run the unit from an extension cord or have something else that draws a lot of power on the same line. The compressor initially takes a lot of power to start.

Air Conditioner Switch

If you hear any odd noises coming from the unit, it could be the compressor trying to start, but unable to do so. Another part that causes odd noises is the overload/relay. This causes a click-buzz-click sound near the compressor. This is the overload/relay working, and it protects the compressor from damage by cutting power to it if there's a problem. If you hear this, the compressor has power, and it means something is wrong with the compressor. If the compressor is the cause of the problem, you'll need to contact a professional appliance repair person.


Air Conditioner Thermostat

Also, any of the control components could be the cause of your problem. These include the control board, the selector switch, and thermostat. The control board controls the overall operation of an air conditioner, and if it is bad, it may prevent the unit from operating. The selector switch is used to adjust the settings that you want on your air conditioner. The thermostat controls the temperature. In addition, the wiring between any of these components could be to blame.

Sometimes the plug for the unit gets burned on the end that goes into the outlet, or the outlet itself gets scorched. This will reduce the contact points and may not allow any or enough power through to operate the unit. If this is the case, you need to replace the plug and outlet as it is also a fire hazard. You may want to call a professional electrician for this job.

Jun 23, 2011 | Haier Air Conditioners

1 Answer

Two winters ago i had to change out my thermostat. Then last summer my AC wouldn't turn on. So i thought it was the thermostat i had so i just went and bought a better one. but still the Fan on the AC...


If the compressors running and the fan is not you should check the fan motor capacitor and check for power at fan motor if power is there you have bad fan motor

Jun 21, 2011 | Air Conditioners

1 Answer

The compressor fan come on; I can hear a clicking (the compressor trying to click on, then immediately shut off. It will contiula doing this as long as the thermostat is set for the ac to come on. I...


Possibly a bad run capacitor, have a service tech test it and replace if it is bad. That clicking you hear is the internal overload in your compressor clicking off on high heat/amp draw and then cooling down and resetting itself.

Jun 16, 2011 | Air Conditioners

1 Answer

My outdoor AC unit is not coming on. Air is blowing out of my vents inside but the snowflake symbol on my thermostat is blinking and the air isn't cold. The fan on the unit isn't even running. Any...


check power to outside unit, check if it has a fused disconnect, if you have power and no blown fuses it could be a blown capicator that starts the fan and compressor...............

May 09, 2011 | Air Conditioners

1 Answer

Fan runs all the time can't get heat or ac to turn on have to unplug heater at outlet to turn fan off


Does this unit have a thermostat on it.If it does there may be a fan run position where the fan would run as long as power was on .See if there is seperate setting for heat and cooling and try them.Hope this helps.Thanks.

Nov 08, 2010 | Air Conditioners

1 Answer

I have 2 dometic ac model #630035.331 the back one will not start on any thing not even on fan. what could be the problem


1. with a tester check if there is power from the AC outlet
2. if there is, check the power in the AC unit
3. if none, check the built in breaker or switch, or fuse maybe blown.
4. reset overload protection if provided

Oct 18, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

I have a 1994 Carri-Lite 633RKS camper with electrical problems


The clicking your hearing from the AC is probably just the 12 volt side of the circuit to run the AC, but it does indicate that the controls/thermostat is doing it's job, but doesn't sound like hydro is getting to AC as well as microwave. I can't imagine those being on the same circuit as far as breaker panel goes, but who knows what might have been done before you got it, unless bought new. Do you by any chance own a plug in circuit/receptacle tester, or anything like that to test for power? In the meantime, make sure AC is in off mode, then go to breaker panel & push breakers for microwave & AC, all the way off hard, then try to reset it & tell me what happens.

Sep 04, 2009 | Coleman Air Conditioners

1 Answer

Ac just stop working. we check the outlet and it is fine. help me please, diane


If you have power to your outlet. The problem is inside the unit. Does the fan run? If it does not sounds like a blown fuse or control problem in the unit. Does the power cord have a reset button on it if so push it. It is ground fault surge protector.

Jul 14, 2009 | Maytag Air Conditioners

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 Air Conditioners

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