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Posted on Jun 05, 2009
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Compressor won't shut off

When the RV reaches telp as set on the thermostat the fan shuts off but the compressor continues to run, untill I shut off at breaker.

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  • john piker Jun 17, 2011

    on this question is the capaciter on the circut board or on the compresser

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  • Expert 122 Answers
  • Posted on Jun 05, 2009
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You have a faulty capacitor you need to replace

  • Anonymous Jun 28, 2012

    I have the same issue,What does the start cap have to do with it,it only sends and extra boost when power has been sent to it to help start the comp. therefore there is a constant power supply to the comp., so it has to be in the temp. control or board....I have the same issue and its not the temp control,its new, so now im looking at the board that distributes power?????

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Related Questions:

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Chiller power pack controlled by ranco temp control won't shut down compressor once it reaches set temperature just runs and runs and runs
There are a few potential reasons why your chiller may not be shutting down even when it reaches the set temperature:
  1. Faulty temperature control: If the Ranco temperature control is faulty, it may not be sending the correct signal to shut off the compressor and fan. Try replacing the temperature control to see if this resolves the issue.
  2. Incorrect wiring: Make sure that the compressor and fan motor are wired correctly through the Ranco temperature control. If the wiring is incorrect, the temperature control may not be able to properly control the chiller.
  3. Dirty condenser coil: A dirty condenser coil can cause the chiller to run constantly as it struggles to cool the refrigerant. Check the condenser coil and clean it if necessary.
  4. Low refrigerant charge: If the chiller is low on refrigerant, it may run constantly as it tries to maintain the set temperature. Have a technician check the refrigerant level and add more if necessary.
  5. Faulty compressor: A faulty compressor may continue to run even when the set temperature is reached. Have a technician check the compressor to see if it needs to be repaired or replaced.
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Nov 13, 2022 • Heating & Cooling
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Until now this unit has never had the compressor run without the fan. Is the compressor running without the fan a problem? If so, what can I do to correct it?
Possibly a tstat issue. Run system until satisfied, once satisfied indoor fan shuts down compressor still runs remove tstat face plate and see if compressor shuts down. Another issue could be a sticking contactor for compressor. With a meter you could check at the contactor to see if you lose your 24volts for cooling but contactor remains pulled in.
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Sep 19, 2021 • Heating & Cooling
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Turned ac off while running well turned back on to soon
shut unit off and wait at least 5-10 minutes before re-starting. do not want compressor to struggle to start. good luck!
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Jul 08, 2015 • Dometic Rooftop RV Air Conditioner
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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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Jun 04, 2015 • Dometic Rooftop RV Air Conditioner
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My domestic rv ac unit reaches the temp setpoint and the compressor shuts off but not the fan, it just keeps on running. Is this normal or should the fan shut off also?
Set fan setting to auto and not high or low setting. Fan will cycle with compressor after setting set to auto or " au" if a digital thermostat.
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Mar 21, 2015 • Dometic Rooftop RV Air Conditioner
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I have a issue with my 2 Dometic DuoTherm air conditioners. The rv is a 2014 Palamuno Saber 50 amp fifthwheel. Ok. They cool very well but at different random times the compressor shuts off while the fan...
how long a power cord do you have and what size conductors are in it. when a a/c shuts down do to thermostat reaching its setting then trys to start back up shortly the pressures dont have time to equalize resulting in high amp draw. if fans runs all the time instead of shutting off with compresser it will call for cooling fast. i have a 2003 cardinal with 2 a/c's the smaller one has a continous fan & the larger one cycles fan with compressor. i have power cord rated for 50 amps. 110 to 115 is still a low vooltage condition.
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Feb 21, 2015 • Dometic Heating & Cooling
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Duo Therm A/C (2009 Sabre RV) won't shut off
bad compressor relay on control board. The relay is not opening the circuit, allowing the compressor to stay running when unit is turned off. This overheats the compressor and opens a thermal disk shutting the compressor off. When thermal disk cools down, the compressor restarts under load and trips breaker.
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Jun 06, 2013 • Dometic Rooftop RV Air Conditioner
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Compressor will not shut off even with thermostat on off
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Be the first to answer Jul 18, 2017 • Dometic Rooftop RV Air Conditioner
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A/C runs but Fan does not shut off when compressor stops. Raising thermostat shuts unit off. fan auto/ on switch works normal. what are possible solutions?
First of all, remove filter at ceiling and with a flashlight or other source, when Compressor shuts off, look way up inside where evaporator coils are and see if you can see ice, or frost on coils/fins. It may be freezing up and fan will continue to run to aid in defrosting.
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Aug 28, 2011 • Dometic Rooftop RV Air Conditioner
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Compressor starts and doesn't stop
Relay for the compressor may be stuck ( Contacts welded) both the fan and the compressor should operate at the same time. Have the relay(s) checked and possibly replaced.
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Apr 29, 2008 • Dometic Rooftop RV Air Conditioner
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Chiller power pack controlled by ranco temp control won't shut down compressor once it reaches set temperature just runs and runs and runs

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