Question about Dometic Rooftop RV Air Conditioner

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Compressor will not start, everything else seems to be ok but no compressor. this is a new unit, has never started the compressor.

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Check the capacitor for the compressor. Also use a voltmeter and make sure power is getting to the compressor. Let me know what you find.

Posted on Jul 03, 2010

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Posted on Jan 02, 2017

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Fujita 3hp split system Compressor won't start

Ohm out the compressor...if it is new & getting the correct power, should be under warranty. You should not have to install a hard start kit on a new unit.

Dec 14, 2013 | Heating & Cooling

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Hi, SAMSUNG SR L39 stops to cool, even if everything seems ok, the fridge is on, the display lit, but food is not cold. Then turn off and turn on the fridge by the power button and everything seems to go...


Many times a freezer and/or refrigeratordo not work right because of a dirty condenser coil...there are also many otherthings that can go wrong. If you are hearing a clicking or buzzing thencheck out the last two tips.

If your refrigerator is running but warm, then...

Check out these tips that I wrote about that... it is a great place to starttrouble shooting your unit...and something that you can do rather then callinga repair person to do a simple thing for you...

Refrigerator Condenser Coil Cleaning Refrigerator Repair

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Apr 20, 2011 | Refrigerators

1 Answer

Just quit working everything seem to be fine, checked continuity on compressor, o.k., but can't hear it start, and the lines to and from seem room temp.

The first place to start is with the power off, place an amp clamp around the "common" wire from the compressor. Now turn the power on and check what your amp draw is. If there is no amp draw, then the compressor is not running. Why is the compressor not running? When you say you "checked continuity of the compressor, ok" I take it that you found your run, start, and common windings, and that by doing a little math you determined everything was good. If this is the case, then check to make sure the capacitor is good, and any starting relay that might be used is in correct working order. Hope this helps

May 07, 2010 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

Fridge is clicking, everything in freezer is thawed

the clicking is the motor start relay . this needs to be replaced . if compressor is ok it will start / if unit is older it may have a bad compressor and will not start up . most units will start up . you can also use a hard start kit . appliance parts dist have these . hope this helps **** .

Mar 26, 2010 | Refrigerators

1 Answer

Black screen

have you tried checking the day time power saving settings to see if they have been incorrectly set

Aug 29, 2009 | Sony VAIO PCG-K23 Notebook

1 Answer

Soleusair 14k btu compressor not running otherwise unit seems ok, just wont cool

verify voltage to compressor terminals and capacitor, if the unit is not blowing fuses or tripping breakers, it could be the start components or the compressor itself.

Jul 20, 2009 | Dehumidifiers

1 Answer

Coleman roof top rv air no cool,warm compressor

No Cooling.
Turn the selector switch to “Cool” and the
thermostat to a low temperature (below room temperature).
The fan runs OK, but the unit does not cool. When the unit
housing is removed, we observe that the compressor does not
run; however, it periodically hums for 15 to 30 seconds.

Possible Causes- Check all of this before buying a new unit, that may not be the solution.

“The voltage could be low – ”
a) Check the voltage between #1 on the
overload switch and the “R” terminal of the
compressor while it is not humming. This
voltage must be 115 volts domestic USA
models or 240 volts export/overseas models.
No less than minus 10% is allowable.
b) Check the voltage from “C” or “R” of the
compressor while it is humming (trying to
start). The latter reading will probably be
lower, but it still must be 103.5 volts
minimum domestic USA or 216 volts
minimum export/overseas models.
If the first reading is above 103.5V domestic USA and
the second is under 103.5V domestic USA, there is
too much voltage drop in the lines - a situation which
must be corrected for the air conditioner to perform
safely and satisfactorily.
2. “A capacitor could be shorted, weak or open.”
Turn the power off.
Caution – There is always a chance that a capacitor is
holding a residual charge, so before touching a
terminal, discharge the capacitor as explained earlier
in this booklet.
Remove capacitors, visually examine them and test
them per instructions given in earlier section on
capacitor testing (See page 9).
If the capacitors test OK, replace them and carefully
reconnect the wires. Be sure the wires are connected
to the right terminals.
3. “Start relay contacts could be open – ” if so equipped.
Turn off all power, then check for continuity with
ohm meter between terminals 1 & 2.
4. “Compressor start winding could be open or
Check compressor windings per instructions. See the
section on the compressors (See page 8).
5. “Compressor could be mechanically stuck.”
This very rarely occurs and when it does, it is usually
after a lengthy shutdown. This should be considered
only after all the above possible causes have been
positively eliminated. To free a stuck compressor, use
your hermetic analyzer according to the
manufacturers instructions.

Jun 27, 2009 | Coleman Mach III Air Conditioner

1 Answer

AC/Heatpump units cycle numerous times blowing ambient air.

If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze

Feb 07, 2009 | Dometic Rooftop RV Air Conditioner

3 Answers

Compressor to kenmore refrigerator keeps clicking on and off.

Before giving up on the compressor you should do the following:
1. The compressor is evidently not running. You can try to start it manually instead of allowing the refrigerator start unit to do so. If it then runs you need a new start/overload unit...about $20 to $60 depending on where you get it. Do not continue to allow the unit to cycle off and on with the overload as that can eventually cause compressor harm. To start it manually the best way is to unplug the frige and completely unhook everything from the 3 compressor terminals. If your unit has a start capacitor you should then short it with a wire or screwdriver to discharge the capacitor to prevent you from being shocked with the fridge even unplugged. Then make up a test setup with wire so that you can apply 120 vac between the run (R) and common (C) terminals. The test set up wiring should include a push button switch to make momentary connection between the start(S) and run(R) terminals. Then with your wiring connected as described plug the test wiring into an outlet and push the button for 2 or 3 seconds and then release. Do not hold the button down longer. The compressor should start and run. If it starts your compressor is ok. If it does not start to run then your compressor may be may be stuck internally with a speck of grit or something and it may still be possible to get it unstuck with additional procedures. If the compressor runs starting it manually you can turn your thermostat to very cold and the compressor will continue to run perhaps long enough for you to buy the start/overload replacement parts and keep your food from thawing.
2. If the compressor will not start manually then according to "Modern Refrigeration & Air Conditioning" bookby althouse/Turnquist/Bracciano you can perhaps start the stuck compressor by:
A."Connect the 120 vac motor compressor into a 240 vac power circuit using a starter cord. One must be careful. Press the push-button switch for only a second at a time or the motor will be damaged. the extra voltage may break the stuck compressor loose."
B. "An extra torque method is to connect a 240 V, 100 mfd(microfarad) start capacitor across the terminals of the run capacitor for no more than one second. (Count "one thousand one.") This may free the compressor.

If none of the above starts your compressor it will need to be replaced.

Nov 15, 2008 | Refrigerators

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