Question about Mitsubishi MS-A09WA Split System Air Conditioner

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Split HVAC does not achieve requested temperature

This newly installed Mitsubishi air conditioner/heater fails to supply the requested temperature. It has run, at best 11 degrees lower than what is being called for.
Also, this unit is installed inside an apartment, with 2 windows acting as the air exchange sources. On a very cold evening the unit leaked so much water that there was ice built up all over the floor and part of the wall (a reasonably substantial amount, like 2 inches thick). My installer is getting no where with these problems.
Thanks for reading this.

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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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Posted on Jan 02, 2017

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Hello Hottie,
start by verifying that the outdoor A/C breaker is in the on position. If it is then there is a problem inside the unit (most likely a split capacitor failure) and you should have an HVAC company help you out because that is HIGH voltage.

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Unit will heat only will not cool and how to repair


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I have a 1999 Chevy Malibu and the AC turns from inside air output to outside output on it's own. You can push the inside air button and it will go back and then in a second or two it will go back to the...


Yes , the Refrigerant level is good , I would say the control panel is bad , or there is a problem with HVAC Air Delivery/Temperature Control Circuit Description
The vacuum actuators move the air valves in the HVAC system (except the temperature valve). Vacuum is applied to the actuators through the mode selector in the heater A/C control assembly. The mode selector consists of a rotary vacuum switch. The rotary vacuum switch supplies vacuum to the vacuum actuators according to the operating mode selected by the driver. A small servo motor moves the air temperature actuator. The small servo motor positions the door according to the voltage level from the temperature selector in the heater A/C control assembly. The temperature selector is a potentiometer positioned by the temperature control knob on the front of the heater A/C control assembly.
Air Temperature Actuator
When the ignition switch is in the RUN position, battery voltage is applied to the air temperature actuator. The actuator receives ground at all times through the following components:
• CKT 251
• Ground G204
The temperature selector is a potentiometer with a wiper arm. The wiper arm is electrically tied to the air temperature input through CKT 733.
When the temperature selector is moved between COLD and HOT, voltage to the control input varies between 1 and 12 volts. The temperature valve motor solid state circuitry performs the following tasks:
• Looks at the control input voltage
• Moves the motor to correspond to the control input voltage
The temperature valve moves for the following reasons:
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• In order to allow the air to pass around the heater core
This control achieves the desired passenger compartment temperature.

HVAC Air Delivery System Check
Step
Action
Yes
No
1
Start the engine.
Turn the blower motor fan ON and select an air outlet mode.
Does air flow out of the selected HVAC outlet ducts?
Go to Step 3
Go to Step 2
2
Did the customer concern mention that the air discharges out the correct ducts at first, but then changes during higher engine RPM?
Go to Step 7
Go to Step 3
3
With the engine running, cycle the HVAC controls through all the modes.
Does the air come out of the selected outlet ducts?
Go to Step 18
Go to Step 4
4
With the engine running, take a vacuum reading at the manifold vacuum port that supplies vacuum to the HVAC vacuum control assembly.
Is there engine vacuum?
Go to Step 6
Go to Step 5
5
Repair the no vacuum condition.
Is the repair complete?
Go to Step 18
--
6
Take a vacuum reading at the vacuum supply line at the HVAC vacuum control assembly.
Is the vacuum reading the same as the engine vacuum?
Go to Step 11
Go to Step 8
7
Disconnect the vacuum supply line from the HVAC vacuum control assembly.
With the vacuum gauge connected to the vacuum supply line, re-start the engine and turn the engine OFF.
Does the system lose vacuum after turning OFF the engine?
Go to Step 8
Go to Step 11
8
Inspect for leaking or collapsed vacuum lines between the engine manifold vacuum port and the HVAC vacuum control assembly.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 10
9
Repair or replace the collapsed or leaking vacuum line.
Is the repair complete?
Go to Step 18
--
10
Replace the vacuum reservoir tank.
Is the repair complete?
Go to Step 18
--
11
Using an external vacuum source, apply vacuum to the appropriate vacuum line at the connector to the HVAC vacuum control assembly.
Does the actuator retract?
Go to Step 17
Go to Step 12
12
Inspect for leaking or collapsed vacuum lines between the actuator and the connector to the HVAC vacuum control assembly.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 13
13
Disconnect the vacuum line from the actuator.
Apply an external vacuum source to the actuator.
Did the actuator retract?
Go to Step 14
Go to Step 16
14
With the actuator disconnected, inspect the door for binding.
Does the door move freely?
Go to Step 16
Go to Step 15
15
Repair the appropriate binding door.
Is the repair complete?
Go to Step 18
--
16
Replace the appropriate vacuum actuator.
Is the repair complete?
Go to Step 18
--
17
Replace the HVAC vacuum control assembly.
Is the repair complete?
Go to Step 18
--
18
Cycle the HVAC controls through all modes to verify proper operation.
Did you correct the condition?
System OK
--

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1 Answer

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1 Answer

Installing a sump heater or cold weather use.


air conditioner can work at 0 deg C outside temp and you do not need a heater for compressor if is split system.

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