Question about Mitsubishi MSH09TW Air Conditioner

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Heat Pump Cycling too frequently?

On heat mode, unit runs for approx 2 min , cycles off and on for another 2 min. Should it not keep running until up to requested temperature?

Posted by Larry Malukas on

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1 Answer

Robbie Daniels

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It should run until it reaches the temp. setting on the thermostat.
Do you have a make and model number so I can assist you?

Posted on Jan 12, 2014

Testimonial: "Thanks Robert, It 's a Mitsubishi Mr Slim Model MSH-09TW"

  • 2 more comments 
  • Robbie Daniels May 20, 2014

    Do you see a blinking LED light on the inside unit?

  • Robbie Daniels May 20, 2014

    If you see the LED blinking there is a system malfunction. The number of times it blinks is a diagnostic code. You will need the service manual for the equipment to diagnose the problem. If you don't have the manual

  • Robbie Daniels May 20, 2014

    If you see the LED blinking there is a system malfunction. The number of times it blinks is a diagnostic code. You will need the service manual for the equipment to diagnose the problem. If you don't have the manual

  • Robbie Daniels May 20, 2014

    You can pull the manual up online at the Mitsubishi website. Don't get the installation manual. You need the service manual.

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5 Related Answers

Anonymous

  • 121 Answers

SOURCE: split HVAC does not achieve requested temperature

If is heating on outside temp must bee max 5 degree
Celsius.If leak inside unit then check drain hose.

Posted on Feb 15, 2009

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Anonymous

  • 4 Answers

SOURCE: inside fan not running in heat mode

i belive these units may have a cold air prevention sensor in them which wont allow fan ops until the coil reaches temp

Posted on Mar 05, 2009

Donni Steen

  • 687 Answers

SOURCE: I have power running to the indoor units but the

Have you checked the breaker to the outdoor unit? Have you checked to see if your indoor unit is calling for it to come on? You will need to do a complete breakdown on the unit to see if the two are communicating with each other. It could be the control board outside.

Posted on Apr 01, 2009

richroth

Richard Roth

  • 9472 Answers

SOURCE: Our heat pump is blowing

Below is a quick breakdown of the BTU's. One as you can see is at 65 degrees and the other is for 17 degrees. The BTU's are more than cut in half at 17 degrees as you can see. Your heat pump will struggle at the lower temperatures.
Outdoor Heating Air Compressor Air Capacity Flow Current (deg °F) (BTUH) 65 23,529 17 11,200

Posted on Jan 24, 2011

heatman101

D. Floyd Kolb

  • 43501 Answers

SOURCE: My unit is a Mr.Slim Mitsubishi Elecric Serial


Hi,


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 Jan 25, 2011

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1 Answer

WHAT SHOULD THE heat anticipator BE SET AT ON A MODEL COAT066BDA COLEMAN EVCON FURNACE


The typical starting point for heat anticipation is .4 amp. If you do not have a clamp-on ammeter, adjust it to .45 and observe operation for a few days. If not quite right and still short cycling slip it to .5. Then keep doing this until you are satisfied cycle time is correct.

If you have an amprobe or can borrow one, remove the stat and take a single loooooong thermostat wire. Attach it to the R or Rh and wrap it around the clamp on ammeter ten times then attach the other end to the W terminal. The furnace will initiate the heat cycle at that point. Observe the amp reading on the amprobe when full heat is on, DIVIDE that reading by ten (for the wraps of wire) and adjust the heat anticipator to THAT setting.

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1 Answer

Heat pump problems


Some heat pumps have high and low pressure swiches installed to keep compressor from running when unsafe conditions occur that can damage the compressor. If the outside fan is not turing on, the unit is cycling on high pressure, if you see ice forming on the big refrigerant line coming from the air handler, then the compressor is shutting down on low pressure. Low pressure can be cause by lack of air flow through air handler or from a low refrigerant charge.

Feb 13, 2014 | Intertherm Heating & Cooling

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I have a goodman self contained heat pump that is 3 and 1/2 years old. I wake in the night to hear what sounds like the fan runnning and running and running and air moving thru the vents. Then I will hear...


Heat pumps are a very efficient design when working properly. But lose efficiency the colder it gets outdoors. I usually tell people when it drops below freezing to turn the thermostat to aux or em. heat. A heat pump can remove heat from 20°f air. But not very well. More heat at 30°f air, obviously, and so on. So the colder it is outdoors, the longer it will operate to remove heat from outdoors. And then, if it can't keep up, it brings on the electric heat elements to compensate. Now you are running both outdoor and indoor heat. This is where it's inefficient and costly. Also, the outdoor will start to freeze up. This is normal unless you can see a substantial amount of ice. The heat pump will engage defrost mode, cycling on the electric heat indoors. And defrost mode is actually cooling mode! The reversing valve in the heat pump switches to cooling mode, cycles off the outdoor fan, and defrosts for a set time or temp. So now your electric heat is engaged, and your indoor coil is a COLD coil! Not hot! Very inefficient. These 2 things are why your elec bill is higher in the winter. So it makes sense to me, if the elec heat is going to be on anyway, to move the tstat to aux or em. heat, when it's going to be below freezing outdoors. This will turn off the heat pump and use elected heat only. The only down side to this is, if you don't have enough elec heat to keep you warm, you may need both heat pump and elec heat. So trial end error until you find what works. Also, have a qualified tech check the system for operation and efficiency. Hope this helps!

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2 Answers

Heatpump r-22 rudd system,unit runs starts out heating then compressor stops in middle of heating ,this unit has a out side air temp. sensor just wondering if possible bad board or not


If compressor stops in middle, check the following.
1.Thermostat setting must be minimum +3 degree than your room temp
2. Check it's in heat "mode"
3. Check indoor and outdoor coils are clean.
4. Check fan motor is working alright.
5. Outside sensor and room air sensor is placed correctly.
6. Gas pressure is o.k
7.Check compressor is overheated, even all the above is o.k.

Jan 12, 2011 | Ruud UAPA024 Air Conditioner

1 Answer

I have a 18000btu LG mini split heat pump installed about 1 year ago in vacation home. In heat mode the unit cycles on and off when room temp is within 2-3 degrees of set point. Cycle on time varies...


Hello.I think they are on to something with shortcycling on temp sensor.I think it should be sampling the return air instead of (inside coils ?).A 2*f dead band use to be built in (factory installed) to thermostats to prevent on/off, but not sure in this case.Try a new sensor location(return air) and see if anything changes.

Oct 26, 2010 | LG LS-L1210CL Mini Split Air Conditioner

1 Answer

No heat micro keeps cycling through all programsdemo in cook/bx


My GE doesn't have a Demo mode but say we have a power failure. It won't let me use it until I set the clock.

Try that and see if it helps

May 26, 2009 | GE Profile Spacemaker Over-the-Range...

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

Mar 28, 2009 | Carrier Heating & Cooling

1 Answer

Compressor fan not running


Does it look like the coils are frosting over? Is it steaming? Keep watching, after about 30 min does the fan come back on?

If yes to any/all the above then the unit is probably in defrost mode and yes the fan will stop blowing during that time, but restart when the unit goes back into regular heat mode.

During this time you will likely notice warmer heat from the vents than normal and the "AUX or EM HEAT" light will be on.

That is your backup heat system. It should automatically come on during a defrost cycle.

Dec 06, 2008 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Air handler only blows air for 3-5 minutes before shut off & not cycling frequently


Sounds like it could be a very weak run capacitor on the blower motor. Run capacitors are sized specifically to the needs of the motor. When a run cap gets weak, the motor trys to compensate for it by drawing more power. More power draw = more heat in the motor, then the motor will overheat and shut off to protect itself. When the motor cools off it will automatically restart and run until it overheats again. Keep in mind that I am a technician that normally diagnoses equipment in a hands on manner. There are many practices and concepts that transcend all air conditioning systems but it is a constantly evolving industry. I live in south eastern WA and I don't see Amana units except as window units. It is possible to have something else causing this problem (faulty thermostat, failing thermal relay(if used), problem with electronic controls(if used)) there are a lot of potential variables

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