Question about Mitsubishi MS-A09WA Split System Air Conditioner

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Unable to balance Mitshubishi Split System. When running the a/c downstairs is freezing and upstairs as hot as Hades. We have tried adjusting the tstats and verified they are in correct positions. Is it possible to run the upstairs system only? Thanks for any help.

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  • Ebenezer Idowu May 11, 2010

    I guess the unit is working on the reverse side, please check your setting on the remote control.

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  • 38 Answers

Do flashing else leak check the pipe line

Posted on May 07, 2010

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My upstairs temperature is 80 degrees and the downstairs is 69 Honeywell focus pro th6000 is set at 69. Why is the upstairs so drastically hot?unit is located upstairs& thermostat is downstairs


if there is no control of air movement between floors and you have it on cooling then any cold air will go down to the lower floor
or alternately if you have it set on heating all the hot air will rise to the upper floor
where is the system located (upstairs or down stairs ) and where is the thermostat located
to get control close any upstairs to down stairs doors or erect a heavy curtain across the stair well

Dec 17, 2016 | Honeywell Heating & Cooling

1 Answer

Zone cooling not delivering adequate air to both zones simultaneo


You need to have someone evaluate the ductwork for the home. With all zones calling, there should be an even balance of airflow. And when only one zone is calling, there should not be the tornado effect you describe.

The dampers feeding each zone may be of the wrong size. It also sounds as though you are also having a problem with your bypass damper. This damper is designed to bypass excess air when only one zone is calling. It is operated typically off the airflow alone.

Have it check out. You definitely have a problem. I would recommend getting it looked at by a company other than the installing company to remove any bias judgment or diagnosis.

Jul 31, 2010 | Heating & Cooling

1 Answer

I have A whirlpool hot water heater I can get hot water downstairs but not upstairs through the shower and tub


Upstairs do you get hot water to your sink faucet. If you do this indicates to me that the temperature valve in your Shower & Tub may need to be adjusted.

For single handle please remove handle to gain access to dial that adjusts hot & cold water mixing.
Remember where it is and take it out and replace about a 1/8 to 1/4 turn counter clockwise and reinstall and try.

It is a plastic adjustment dial that will slide off after the handle is removed.

Trace lines if possible to assure correct pipe's are connected to valve.

May 20, 2010 | Home

1 Answer

We had no heat in rads downstairs we changed pump and flushed system no we have heat downstairs but not up any ideas?


Make sure the air is bled from the upstairs rads.
[air = top of rad is cold & bottom hot]

If you need to balance the rads to maintain an even flow through all then :-
Turn off all rads [one valve fully open and the other closed] Get heat going and open each rad valve, in turn, about 1 or 2 turns. Start with upstairs. The position you need to get to is when the return pipe fron each rad is a few degrees below the flow pipe. Adjust each rad valve to get this effect a few times may be necessary

Mar 19, 2010 | Water Heaters

1 Answer

I can only get heating to the radiators upstairs, not downstairs


balance the rads.
upstair radiators turn all valves off,heat will then divert downstairs,open valves upstairs 4 turns on locksheilds and number 4 on trvs if u have any.
then if that does not work get a combi or powerflush.
if u cant afford then drain a little from rads,get x300 sludge remover from plumb shop and put in header tank(not hot water tank).
then fill system up and repeat balancing.

www.jollygreenplumbingmachine.co.uk

Dec 26, 2009 | Desa International CBN30T Central Heating...

1 Answer

2 zone sytem main floor cooler than what i set it to


Warm air rises and if the upstairs thermostat is on it will onerride to lower the temp upstairs. To have the dowstairs thermostat govern, the up stairs must be off . The whole house will balance to the controlling thermostat.

Jun 02, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

3 out of 7 rads working with hot water


This is a flow problem within the system and you have ruled out the two major problems already.
asuming the pump has been fitted in the correct way round and the pump isolation valves are open fully. have you tried closing down the radiator valves upstairs and forcing the flow around the downstairs circuit? also is there any zone valves on the circuit not opening.
Is it a conventional type system with a header tank ?

Feb 01, 2009 | Heating & Cooling

1 Answer

Heating blowing coo air downstairs and warm upstairs?


Some of this depends on where the air handler/furnace is located. Most often in two story houses, it's in the attic upstairs, or in a closet upstairs. A duct routes air from the furnace to the downstairs supply duct, so it is a distance from the air handler.
When the unit first initiates a heating cycle, that duct is going to be full of cool air, and the duct itself will be cool. So the furnace has to run long enough to push the cool air out, as well as warm the duct up, before your going to feel warm air at the registers downstairs.

Keep in mind, heat rises. And, your thermostat only monitors the immediate area where it's located. In your case, upstairs.
Two story houses are problematic because of this. And one way around it is to have a damper system installed that distributes the air upstairs or downstairs based on a thermostat located in those spaces. There would be 2 dampers, and 2 thermostats (one upstairs, one downstairs). Each stat would control a damper, and the call for heat or cooling.

Let me know if you would like to consider a system like this, and I can point you to components to use. I've put several system like this in.

Jan 26, 2009 | Kitchen Appliances - Others

1 Answer

No air flow upstairs


Cold air is denser than hot air, so is harder to move. All vents have some mechanism to regulate flow, so close all of the downstairs vents. Check to see if your furnace fan motor has more than one speed, & set it on maximum. Keeping the fan on all the time will help as well. If all else fails, you may need a more powerful fan motor.

Jun 16, 2007 | Weather King 12AJA4801AH Air Conditioner

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