Question about Ruud Central System Air Conditioner

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The voltage to my unit is right, the fan does like it wants to start but then dies off, and repeats, the compressor wont start, the unit is 3 years old.

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Hello Sounds like the RUN CAPASITOR is shot.It looks like a large flashlight battery with 3 termninals on top.Is it leaking sap?Is it expanded like a frozen beer can?You need 2 numbers off it the UF value & the volts printed on the side of the can.Replacing it should reslove your problem.Repair any burnt wires.A tight/clean connection is important.

Posted on Aug 28, 2010

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Posted on Jan 02, 2017

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a good service tech dont need a diagram he will just know how to do it. took me around 2 years before i could rewire a unit . you need power to certain things and you just go from there
ie: you need power to blower. you need power to transformer need secondary voltage from transformer low voltage makes the switches for things to come on or off. the compressor and starting for it has to be right or it wont run contactor has to be wired right. run cap has to be the right mfd and wired right are you working on something thats 230 volt single phase or 3 phase
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The fan on my outsie unit of my grand air heat pump won't turn on. The compressor hums. If I manually turn the fan it will run but very slowly.


Your description is possibly a bit vauge for the problem it could be, but starting from the compressor, question is "can you hear the compressor running"? If you can then switch off quickly and check the cooling fan capacitor. almost certainly it has popped.If it has, and even with a new capacitor it wont start, then a complete condensing fan unit is required.If the compressor isnt running, then one of a few things could be the problem. A- The voltage getting to the compressor or the cap, is not correct which points to a problem with the board. B- If the compressor is jambed,(siezed),then it is bringing the voltage down to the point where even the fan cant run. Need to check those points to determine the next course of action.

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1 Answer

Compressor appears to kick in, runs for short time


It sounds like your unit may have a bad run capacitor or start capacitor and relay. Low voltage will also cause this problem. First you need to make sure that you have the full rated voltages at the unit, if you do, then, have the run and start capacitors checked out and the start relay.

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Fujitsu inverter air cond. Just stopped working properly. Model outdoor AOT30PMAL indoor unit AST30PBA-W. Code oper. Red led flashes fast continously green led (timer) repeats 13 slow flashes. After power...


It sounds like your inverter is at fault. You will need an inverter tester ( most good service techs will have one ) to prove that the output to the compressor is correct. If the inverter is okay then it will be the compressor at fault with a location error or it is simply seized. A common fault that caused this was the eev remained closed (coil failure ) and caused the compressor to over heat.

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2 Answers

Fan runs but wont cool


fan may be running...but you need to see if the compressor that moves the freon is running

May 10, 2010 | Heating & Cooling

3 Answers

Please help our ac compressor wont come on


Hi, did you change, capacitor for compressor too. check compressor overload switch,(relay) normally located on compressor terminals, (where you connect wires to compressor) that's the device that goes klix when compressor goes to start, could be faulty, or maybe low voltage from your mains(house panel) check line voltage, with digital volt meter, some compressor won't start if voltage drops to low, yes fan will work, could also be, your compressor has a lock rotor, (hard start), you can buy a compressor hard start kit, from appliance store, and try to start compressor, or maybe compressor internal winding, are damage, especially now in summer, when you got a lots of voltage drops, check compressor winding, check compressor winding for short circuit, remove cover on compressor, remove 3 wires from compressor terminal, use ohm meter, put one tester lead on copper tubing that's connected to compressor, and next lead to compressor terminal, one by one, if you get beep (continuity) from anyone of those compressor terminal, you got a short- circuit in compressor, you will have to replace compressor, but if there's no short, them try hard- start kit, replace overload relay, you will see it at compressor terminal location, after you remove cover. good luck.

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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
grounded.”
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.

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1 Answer

The fan runs constantly. The compressor starts,


Check the compressor run capacitor first.

Jun 21, 2009 | Kenmore 53701 Dehumidifier

1 Answer

Wiring compressor


The two terminal cap is only for the new fan motor. Connect the compressor wire back where you found it, on the 3 terminal cap. It's the terminal marked, "herm". The "common" terminal on the 3 terminal cap must still be connected to one side of the 220 power at the contactor. One side of the 220 goes to the common on the compressor. The other side of the 220 goes to the run winding on the compressor AND the common terminal on the 3 terminal capacitor.

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