Air conditioner stops while operating and flashes ''check'' get service technician -have no manual .

12.11 Freeze Prevention Control 2
• Control start conditions
o During Cooling operation and soft dry operation ? During thermo OFF condition, indoor intake temperature is less than 50°F or ? Compressor stops for freeze prevention control
o Either one of the conditions above occurs 5 times in 60 minutes. • Control contents
o Operation stops
o Timer LED blinks and "H99" indicated
You may need the assistance of a technician. Service manual located here:
http://www.mcaair.com/docs/panasonicac/CS9NKUA%20CS12NKUA%20Service%20Manual.pdf

24
EN
TROUBLESHOOTING
CAUTION
If any of the following conditions occur, stop the air conditioner immediately, turn off the main power switch and contact the
dealer.
• The indicators flash at short intervals (5 Hz). Reset the circuit breaker 2 to 3 minutes after the power main switch is turned
off.
Despite the resetting operation, the indicators still continue turning on and off.
• The main power fuse often blows, or the circuit breaker is often activated.
• Foreign matter or water has fallen inside the air conditioner.
• Any other unusual conditions are observed.
Before asking for servicing or repairs, check the following points.
Recheck
Inoperative
• The power main switch is turned off.
• The circuit breaker is activated to cut off the power supply.
• The main power fuse has blown.
• The electric current has stopped.
• The batteries in the remote controller used up.
• The ON timer is set.
• As a protective mechanism for the air conditioner, it does not operate for 3 minutes
immediately after restarting operation or turning on the main power.
Poor cooling or heating performance
• The air inlet or outlet of the outdoor unit is blocked.
• Doors or windows are opened.
• The air filter is clogged with dust.
• The louver is not at the correct position.
• The fan speed is set to low.
• The air conditioner is set
to the DRY or SLEEP MODE.
• The temperature setting is too high (during cooling operation).
• The temperature setting is too low (during heating operation). (heat pump models)

One thing that I am not seeing in your description is that the coil sensor has been replaced. I find it strange that a phone tech could diagnose this, send out a technician and not replace this component. Was the service tech an authorized LG repairman? That is where I would start. I would call LG and ask them for a certified technician supported by LG in your area. I feel you will have better luck with that approach.

call in the technicians for a warranty fix

You might be able to find the right manual to help you here:
http://steprightupmanuals.com/air-conditioner-service-repair-manuals/fujitsu-air-conditioner-service-repair-manuals
prem

According to the Owner's Manual if the Error Code flashes "06" the O.D. coil Temperature > 175 Deg
F for 2 consecutive minutes. (Heat Pump models only).

The action taken by the unit is Alternate flash set point and error code. Shut unit down for 5 minutes, then try again 2 times, if fails the 3rd time, then shut down unit.:

All of this is can caused by several things:

• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted air flow
• Improper refrigerant charge
• Restriction in refrigerant circuit

The dirty filters, dirty coil and restricted air flow you can troubleshoot and solve yourself. The reaming ones should be handled by a an authorized service technician.

Here's a link to your Owners Manual, that you can download and print for future reference.

http://www.ajmadison.com/ajmadison/itemdocs/92008705_9-07_PTAC_IO_manual.pdf


Hope this helped to to troubleshoot and solve the problem . Please let me know. Thanks.

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

replace the thermistor

Can you check the service manual for the diagnostic code?

you most likely need a service guy to go out and take a look