Question about Mitsubishi Mr. Slim MXZ30TN Air Conditioner

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Indoor unit turns on, then compressor turns on and runs about a minute and shuts off, then indoor unit turns off and left light blinks. What is wrong?

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Sonds like a short somewhere in the system

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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1 Answer

Luxpro psd111 thermostat shows snowflake (sometimes blinks), outdoor fan works, but no cool air comes out inside- no air flow at all. Is it the thermostat or an a/c unit malfunction?


If the outdoor unit is running the indoor fan should definitely be running. Turn power off to indoor unit. Put red green and yellow wires together behind the tstat with a wire nut. That is power (red), indoor fan (green), and compressor (yellow.) Turn power back on. This is bypassing the tstat and you should have indoor fan and outside running as well. If yes the problem is in the tstat, if no indoor fan the problem is in the unit. Good Luck!! Let me know!!

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Indoor unit indicator
RUN lamp = 6 time flash
TIMER lamp = Comes on
Outdoor unit indicator (LED5) = Stays off
Description of trouble = Indoor fan motor error (2)
Cause = Defective fan motor, Connector poor connection
Conditions of flashing = When air conditioner is operating and indoor fan motor is turned ON, indoor fan motor speed of 400 rpm or under continued for more than 30 seconds. (Air conditioner stops.)

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How to troubleshoot thermostat wiring?


I'm not sure if the thermostat is wired correctly. First, the thermostat is wired directly to the outdoor unit (compressor/condenser unit). It is NOT directly connected to the indoor unit. It connects to a low voltage control panel in the outdoor unit that sends a signal to your indoor fan/evaporator. This wire is called the fan relay switch and physically runs between the low voltage controls of the indoor and outdoor units. If the fan relay is bad it's possible that the unit runs continuously. To prevent destroying your outdoor unit there is a safety feature that prevents the indoor fan from shutting down while the outdoor unit is running. If the indoor fan did shut down while the outdoor unit was running than you would slug your compressor. That is, your compressor normally sees refrigerant gas but is instead seeing refrigerant liquid. That would not be good since this scenario would destroy your compressor. It sounds like a faulty fan relay. The actual contactor portion of the relay is in the outdoor unit.

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1 Answer

A/C runs fine for 7-8 minutes, then shuts off.


AHX18MEV
4 - 12
[8] SELF-DIAGNOSIS FUNCTION
1. Indoor unit
(AH-X18MEV, AH-X18MEV-1, AH-X24MEV, AH-X24MEV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The operation lamp (red), timer lamp (orange) and Super jet lamp lighter) flash to indicate the information of malfunction.
(Display of self-diagnosis result)
The operation lamp (red) and the Super jet lamp (green) flash in synchronization with the timer lamp (orange).
(AH-XP18MV, AH-XP18MV-1, AH-XP24MV, AH-XP24MV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The POWER CONSUMPTION indicator indicates the information of malfunction by showing the main category error (number) and the sub-category
error (-number) alternately in 1-second intervals.
Example: Compressor high-temperature error
Remark

May 11, 2013 | Sharp Heating & Cooling

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.

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1 Answer

My split type 2.5hp carrier express ion shuts off (including the condenser) after five minutes of running, the indicator light blinks during this time...it restarts again after awhile, then shuts off again...


How many times is the light blinking? Also is the light red, yellow or green? The light blinking is telling you exactly what has failed.
(# of RED blinks first)

1 High Pressure Protect
2 Indoor coil freeze protect
3 Low pressure protect

4 Compressor discharge protect

5 Low pressure/Overcurrent protect

6 Indoor-outdoor communication error
8 Hi-Temp protect
10 AC Voltage Low


Each of these has maintenance required steps to resolve the errror. Let me know how many blinks your getting...


Kelly





Apr 25, 2011 | LG Heating & Cooling

1 Answer

Out door unit not running, left green led on indoor unit blinks.


conduct shutt off the main breaker of your unit then after several minutes try to shut it on please adjust your thermostat setting conduct observation.

Feb 20, 2011 | Mitsubishi MSZ09UN Air Conditioner

1 Answer

Indoor Unit power on (green LED) blinking


Indoor is working? If yes, it's for waiting for compressor starting. Wait for 3 to 5 minutes. If still it's flashing, problem with indoor PCB.

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1 Answer

My split unit air con will switch off automatically every 10 minutes and the lights will blink. It can only be turned on again if the power is switched off from the mains.


May be in indoor screen there is some error code. Don't worry. I try to solve it. Normally after 3 minutes compressor will start. If compressor amps gradually increase due to condenser block or less rpm of fan motor. Please ensure with amps meter for increasing ampere It will run just 10 minutes or up to the maximum running amps and get tripped. Service your indoor and out door and check. . Is it helpful?

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3 Answers

Aircon runs for a few minutes then shuts down and timer light flashes


when we start the AC indoor working and out door unit compressor working but fan motor not working and indoor timer light blinking

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