Question about Dometic Rooftop RV Air Conditioner

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With thermostat in the off position compressor continues to cycle continuously every 5 minutes for 1 minute. Is this normal operation for the unit??

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Yes it is a normal operation
dont worry

Posted on Jun 29, 2009

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The thermostat is set to off. The compressor keeps kicking on. Need help asap, camping now.


If the compressor is constantly running and not cycling off then the contactor is stuck in the closed position. If the compressor is cycling on and off and on again then there is a short in the low voltage circuit. Could be anything from the t-stat to the control wires. Normally the contactor points will stick closed and the outdoor unit will continue to operate with the t-stat in the off position(or any position). The contactor is the only part on the o.d. unit where the main line voltage wires connect to the unit. There is 1 moving part in the center that may be stuck closed. Turn off power at the breaker or disconnect box at o.d. unit. If this unit cools without the indoor unit operating it will freeze up, allowing the compressor or to remain at the indoor coil and it may/WILL damage the compressor. Call a technician!!!

Jun 13, 2015 | Heating & Cooling

1 Answer

On my 2004 Grand Prix, my car has to be running for at least 45 minutes for some heat to work.The yellow light by the heater blinks while the blower comes on and goes off repeatedly until the light is...


It is possible that your thermostat is stuck open. Normally, the thermostat remains closed when starting cold, confining coolant to the engine block and cylinder head until it heats up. Once the coolant in the block is warm (usually within 10 minutes), the thermostat begins to open and let coolant flow into the radiator to cool it down some. A properly operating thermostat will continue to cycle until the coolant reaches the operating temperature of the thermostat--usually around 180 deg F. Then the thermostat will continue to adjust its opening to maintain that temp.

Thermostats can get stuck in both closed and open positions. When stuck closed, the engine will quickly overheat. When stuck open, the engine will take forever to warm up--especially in cold weather because the coolant is continually pushed into the radiator and cooled off before it ever has a chance to get warm. Changing the inexpensive thermostat may help correct your condition.

Jan 25, 2011 | 2004 Pontiac Grand Prix

1 Answer

OUR REFRIGERATOR RUNS ALL THE TIME AND ONLY SHUTS OFF FOR ABOUT 5 MINUTES A DAY. ALL THE FOOD STAY COLD AND FROZEN IN THE FREEZER. REFG.


Most of the time when a unit runs all of the time there is a problem with the evaporator fan being either blocked with ice or running slow due to a dirty bearing. The 5 minutes a day you are refering too is the time when the defrost cycle is in progress. If the defrost cycle is working properly is should take more than 5 minutes. I would try manually defrosting the unit by unplugging the uint, removing all the contents of the freezer and place a fan so that it blows into the freezer section for about 2 hours. This will melt the ice if any in the freezer section and clear any ice blockage. Mind you this will result in water dripping in places that it normally does not drip so have a mop and rags available to tend to the dripping water.

After the 2 hour period plug in the unit and re-load the freezer. If the problem is corrected by maually removing the ice with the fan then you of course need to do nothing more. If the unit after a serveral days begins running all the time again then it is not defrosting properly. Just reading your 5 minutes a day off time has me thinking that the defrost thermostat has failed in the closed position causing the defrost timer to cycle straight through the defrost cycle vs pausing until the termostat reaches 60 F an closes as it should in normal operation. If that thermostat is closed all of the time there will only be a very short pause 3 to 4 times a day whent he compressor is off. This is not an expensive repair should the uint require further servicing after you manually defrost it. Good Luck.

Jan 04, 2010 | Refrigerators

1 Answer

The unit cycles every minute and the fan continues to run.


you are right the problem is with the thermostat. if this is an all-in-one unit there is a wire that runs from the thermostat to the front of the evaporator coil where the air returns to the system to be cooled. you can try to move the wire further away from the coils and see if it prevents the unit from short-cycling. btw it's not very good for the unit to do what its doing now, as i'm sure you could imagine. if its a separate thermostat i.e. one that runs on 24V and has wires running to the a/c, then just replace it with one from Home Depot and you should be good to go. if it's other than 24V then you will likely have to get a replacement thru the a/c's manufacturer.

Jun 16, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Comperssor kicks on but quickly cuts off intermittently every 5 minutes on my frigidaire fridge side by side


Freezer defrosted everything fan continues to run but will not freeze. Compressor is cycling enough to keep refigerator section cold. 106 Series Kenmore. Turned up thermostat to keep fridge cold and a shorter intermittent compressor cycle run

Jun 06, 2009 | Frigidaire FRS26H5AS Side by Side...

1 Answer

After cleaning coils and in back of fridge, it appears that the defrost keeps cycling every 5 minutes


hi
Step 1:
 If the compressor runs all the time, turn the control knob to the OFF position. If the compressor still runs, unplug the unit, then pull off the control knob and remove the screws holding the thermostat in place. Pull out the thermostat and remove either the red or the blue wire from its terminal. Plug in the unit. If the compressor doesn't run, the thermostat is faulty. Replace it with a new thermostat.

Step 2: 
If the compressor runs after the wire is removed from its terminal, there is probably a short circuit somewhere in the unit's wiring. In this case, don't try to fix the problem yourself; call a professional service person.

Step 3: 
If the refrigerator or freezer runs but the box doesn't cool, unplug the unit and remove the thermostat with a screwdriver. Disconnect both wires from the thermostat. Tape the ends of the wires together with electrical tape, and plug in the appliance. If the refrigerator starts and runs normally, the thermostat is faulty. Replace it with a new one of the same type. Connect the new thermostat the same way the old one was connected.

Step 4: 
If the freezer compartment is normal but the refrigerator box doesn't cool, set the dials that control both compartments to mid-range. Remove these knobs (they're usually friction-fit). Then unscrew the temperature control housing; you'll see an air duct near the control. Replace the knob on the freezer thermostat and turn the control to the OFF position. Open the refrigerator door and look closely at the air duct. If this duct doesn't open wider in about ten minutes, the control is faulty. Replace the control with a new one of the same type. Connect the new control the same way the old one was connected.

Oct 10, 2008 | Amana ARB2557CW / ARB2557CB / ARB2557CC...

2 Answers

Thermostat ?


The Air conditioner are good only the adjustment of thermostat are the problem, select the thermostat in lower #3 you observe the thermostat will off in such time temperature reach to #3 If you full adjustment the compressor will not off.
In fan selector the compressor will autamatic off because no connection attached fan only .

Jan 05, 2008 | Kenmore 73089 Air Conditioner

1 Answer

Motor never turns itself off


If by motor you mean the compressor itself then no, it should not run all the time. The compressor should run until the thermostat senses the temp. is at where you set it then turns off the compressor. A couple of possible things... if the unit has a leak in the refrigerant then it may run almost continuously since it can barely reach the cold setting you have selected. Or the temp. sensor thermostat may be bad and the unit doesn't know to turn off. There is also a defrost cycle that happens about every 12 hours for a few minutes (depending on make/model on how it works) but that should also turn off the compressor and fans until the defrost cycle is completed. Basically it should turn off when the temp. setpoint is reached or when it's in the defrost cycle.

Jan 14, 2007 | Admiral 26 cu. ft. Side-By-Side...

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