Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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My model is a 1994 vintage. The outside unit has 2 fans and 3 compressors. There's obvious damage (burn mark) on the board. The only way I can get the upstairs wall unit to generate cool air is to turn-on both of the other units. My A/C contractor tried to get a replacement board, but was told they're not in production any more.

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Here is a tip about Mitsubishi Air Conditioners and how to get the manuals for all of the Mitsubishi line. The manual include both troubleshooting and installation.

Mitsubishi Air Conditioner Troubleshooting and Repair


heatman101

Posted on Sep 06, 2010

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My goodman unit (1994) makes the loud noise, like a buzzing noise. The unit works, the blower blows air into the house, the air is cold, but the outside fan that blows across the condenser piping isn'


you need to replace your condensing fan motor. the noise you are hearing is the compressor working against a lot of pressure because the heat is building up in you condensing unit. Prolonged operation without an operating condensing fan motor will cause your compressor to burn up, and then you will have the cost of a compressor changeout to the cost of a condensing fan motor.

Jul 06, 2014 | Goodman CLQ36AR49 Air Conditioner

1 Answer

The unit either encountered a brown out or a surge which burned up the board for the condenser. It had black marks on the board and the indoor unit was flashing. Replaced the board and the unit is still...


After replacing the burned condenser board, check also the entire condensing unit if still ok ( compressor and fan motor). If the light inside the indoor unit is still flashing, the timer is still not giving signal for the compressor to start. Adjust temperature and wait for 3-5 minutes. It light continue flashing, there is something wrong with the indoor unit control.

Sep 02, 2011 | Sanyo Split System Air Conditioner

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1. what are reasons why refrigerant compressor burn-out? 2. ice build up on suction line. 3. Insuffecient cooling. 4.Outdoor unit not running, but indoor is operational.


On the split system 1. Can burnout from defect, lightening, etc .. 2. Only way ice will buildup back to outside unit is LOW LOAD.. either from dirty filter, dirty coil or fan blades caked up with dirt. 3.. Poor airflow will cause the poor cooling $ Outdoor unit most likely has a low pressure switch causing the outside unit to shutoff until pressure rises.. Has this helped ?

Sep 03, 2010 | Heating & Cooling

1 Answer

Stop cooling/ 3 years old


If you are not hearing the compressor cycle on and off in intervals and there is no air flow present inside the unit, this will confirm that there has been a severe malfunction within the units assembly. You will need to check the following areas for faults:

1. Compressor- Make sure this unit is functioning. if it is not cycling as designed, this will be the culprit. If it is cycling but very hot to the touch when operating, check the condenser coils for debris and clean them if necessary.

2. Compressor start relay - This is the main on/off switch that is attached to the side of the compressor. This relay, when energized by the main control board, starts the compressor. if the relay has failed, it will not start the compressor, thus, rendering the unit inoperable. Pull the relay off and shack it. If it rattles, replace it.

3. Evaporator fan - This is a very important part of the evaporator core. This is the principal air mover of the unit. If this fan fails, the inside freezer and refrigerator will not cool, at all. You will need to remove all the freezer shelves and content to access this unit. It is concealed behind a panel inside the back section of the freezer compartment. Once the concealment panel is removed, you will expose the core and fan. the fan can be tested with a multimeter for proper continuity. You can also jump the terminals with a jumper wire to see if it is still in working order. An external power source will be needed for this test. if the fan fails the test, replace the fan motor.

4. Condenser fan - This is also a very important fan. This fan is mounted near the condenser coils and can fail. You can test it in the same manner as the evaporator fan. replace the condenser fan if it proves to be damaged.

5. Main PCB(Printed Circuit Board)- This is basically your main power controller. This board routes power to all the fans and compressor unit located in the assembly. it also routes power to the lights and ice maker/dispenser, as well. This will be the most expensive repair, in this case. If all the above areas prove to be functional, the main PCB will be the culprit. You can easily locate this board. It is usually mounted on a bracket, near the compressor platform, or behind a concealment panel on the rear of the unit. Once you have gained access, visibly, inspect the board for burn markings at the relay mounts and jumpers. check the entire circuit board for discolorations like brown marks or black burn marks at the plug-in connectors. If this refrigerator is totally dead, this will be the cause.

6. Monitoring thermostats - These are located in each compartment. Replace each thermostat if all the other checkpoints prove to be ok and in good condition

7. Condenser coils- The condenser coils dissipate heat. If dust and debris accumulate around the coils, your refrigerator may not be able to cool properly, it may run continuously or it may stop completely as a result of an overheated compressor. You should clean rear-mounted coils once a year. Unplug the refrigerator before cleaning. Refrigerators are heavy, never tip one forward or backward. Never attempt to move a refrigerator without an assistant. Vacuum or brush the coils. If coils have a filmy build-up, use warm soapy water to clean them. Take care not to spill or drip water onto the components of the refrigerator.You should clean floor level coils at least twice a year. Unplug the refrigerator before cleaning. Vacuum or brush the coils. Remove the grill from the front of the refrigerator and use a vacuum with a wand attachment to remove any dust and debris. The grill should snap off and on. Pull firmly toward you and possibly upward to remove the grill. If it does not come off with a modest effort, check for screws or retaining clips that may hold it in place.

You will find the culprit in one or all of the areas stated above.

Aug 15, 2010 | GE Profile 22.2 Cu. Ft. Side-by-Side...

1 Answer

AC compressor wiil not turn on


You will have to find the contactor which is located in the outside unit. And check the voltage at the contactor, 26 v as this is the thermostat calling for the compressor to come on. You can also push in the contactor and see if the fan and compressor start. There should be an outside fuse box close to your condensing unit. Good luck

Jul 23, 2010 | Samsung AW1203B Air Conditioner

1 Answer

Sometimes, when the inside blower shuts down, the


I was leaning towards a bad contactor. Either sticking sometimes or not making good contact. I would inspect the contactor for pits or burn marks near the contacts. DO SO WITH POWER OFF of course...but, what's the reset button you are referring to?? I'm assuming this is a heat pump, please send model number!!

Jul 06, 2017 | Ruud UAKA060 Air Conditioner

2 Answers

I have an older Goodman CKB 18-1


FOR QUESTION 1: They do run independantly. What will happen when your compressor is running but your outdoor fan does not, the pressures in the system will go really high and compressor will overload. That outdoor fan is used to disipate all the heat that is transferred from the inside to the outdoor unit.
FOR QUESTION 2: If you hear humming it can be 2 things. FIrst one is that that capacitor went bad. Dependiing if its a dual run capacitor(which helps both compressor and fan motor) or they both have individual capacitors. The second would be a bad fan motor. OPen your service panel outside to the AC. Find your capacitor for you fan motor. if there are 2 , locate the one that goes to your fan motor. Check it out(if its blown physically youll will notice it like really bubbled, like swollen) then change itout. Or you will have a dual run capacitor that runs both compressor and fan motor. It will have the terminals marked (Fan, Common, Herm) Bsically check your capacitor mfd(micro fared rating, it will say on the capacitor what its rated) Get a multi meter and put in the "MFD' selection. Before you check any capacitor you have to discharge the the voltage charge it has. Use an insulated handle screwdriver and just place the metel part across the capacitor leads. Basicall short them out. Then proceed with checks...hope this helps( remember to always pull the disconnect out from the box outside to cut power)

Jul 30, 2009 | Goodman CLJ30AR32 Air Conditioner

1 Answer

Goodman 3 ton outside unit fan not blowing


Motor, wiring and/or capacitor. If the sticker on the side of the motor isn't burned off you can get the motor info off that. Model numbers from the motor do little for locating the motor but my help. Best thing to do is get the AC motor specs and look up online (cheapest) or go to a motor shop. The specs you need would be as follows.
Horsepower-Such as 1/4 or 1/3
Voltage-Most likely 240/1 (240vac single phase)
Rotation-CW/CCW looking at the shaft end of the motor
Amps
Frame size

Jul 10, 2009 | Goodman CKL60AR60 Air Conditioner

1 Answer

On outside compressor for whole house AC: Critters ate wires. Have Blk & Red power in from breaker. 24vac switched from thermostat. 1 contactor with 24vac coil(original). 1 Capacitor w/ 3 terms...


There should be a wiring diagram on the back of the access panel. If you can't read it, check online for model wiring diagram. Don't guess, you may cause more expensive damage.

Jun 25, 2009 | Heating & Cooling

1 Answer

COMPRESSOR NOT TURNING ON


Hello Mattpatoska,

I have no idea what your refrigerator really is...
as I attempt to research I get longer
model numbers... (USA)

Were I you... and ready to put it (frig) out of my misery..
I'd first at least try to look at the compressor...!!

Is it getting AC...??
(
really nice No contact volt tester on Amazon)
((
see below))

Should I try to ...
Open the AC (??)
(so as not to smoke the defrost/compressor control board)

and apply AC directly to PROVE/DISPROVE
your OWN hypothesis.

I would (and have the scars (experience) to
Prove it...

My big piece of advice:
Take notes & pictures of what wires go WHERE...!!


Klein Tools NCVT 3 Non Contact Voltage Tester with Flashlight Amazon com


Carnac the Magnificent

Mar 08, 2017 | GE GTS22KCM Top Freezer Refrigerator

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