Fujitsu AST12LSBCW/AOT12LFBC not working and with flashing lights

[sjbrewy]

Hi,

I started this aircon up tonight and isn't blowing cold air and after 5 minutes it started to flash the green light repetitively and the red light 7 times, does anyone know whats failed here and a list of fault codes for these models. Thanks

[frank]

Here is a link to a previous thread for this error http://www.refrigeration-engineer.com/forums/showthread.php?43605-Help!-Asta12lcc-error-code

[Tayters]

You need to press the test button to further narrow down the fault code but either:

Discharge pipe too hot - generally because it's short of refrigerant but could also be due to airflow issues or possible blockage in system pipework (EEV generally)

or

In cooling mode, outdoor coil getting too hot which is normally because the fan isn't spinning or the coil needs cleaning.

Link to manual: https://www.manualslib.com/manual/926038/Fujitsu-Asy9lsbcw.html

Cheers,
Andy.

Edit: To clear the codes have the code flashing then hold down the auto button on the indoor unit for about three seconds. The unit should beep then the code will be cleared.

[sjbrewy]

Hi,
Thanks for your replies,
I had a look today and a bloody Mud Dauber Wasp had made a dirt nest on 1 fan blade tip and joined it up with the fan shroud, so fan was fixed and couldn’t turn, so I removed/cleaned dirt nest and ran for an hour with no problems, it’s a wonder it didn’t come up with a fan motor fault code, being unable to turn, could of this made some other damage to outside unit from fan being fixed. Thanks

[sjbrewy]

And also on the inside units with the louvers, we have one that it doesn't close up properly when turned off, I think one of the kids moved louvers by hand and it could of jumped some teeth or broken some, whats the procedure in removing/checking out the louver gears.

[Tayters]

On this model there is no feedback from the motor on how fast it's spinning so it's going off other sensors instead. An odd fault but proves the design works!
It's possible the fan motor capacitor had been damaged. If the motor doesn't always start and needs a push to get it going then a good sign. To confirm you need a meter with capacitance scale to measure. Compressor also might have taken a hiding but if it all runs up then just keep tabs on it and it should be alright.
Regarding the louvres you should be able to open them yourself without damage so kids might be in the clear. The motor is to the right. Have to confirm the louvre end is fixed into the motor, it shouldn't be floppy. If it's in fine then probably the motor faulty but check the plug is in. If there are two motors, one per louvre, the see if you can swap plugs over from the PCB to confirm board is fine.

Cheers,
Andy.

[sjbrewy]

Ok Thanks Andy, it would of been good when the outside fan didn't spin, that it should not have tried to start up at all, so it doesn't potentially damage compressor etc, as when I went outside that night to see what was going on, it was making a clicking/knocking noise, so went and turned it off, I had it on last night for 9 hours and worked great and not clicking/knocking noises, so what was this noise, as it was coming from compressor side? and as sound as fan was free, it didn't do it again, was it a solenoid/valve/compressor?
And regarding the inside unit louvers, the motor is on the right hand side, yes the kid moved the louver down by hand and might have jumper some teeth or stripped some, is it a big job to take apart the motor/gears and reset them. Thanks

[Tayters]

Clicking and knocking probably the compressor losing the fight against sky high refrigerant pressures. Agreed that a pressure switch should be fitted as relying on a temperature probe to do the same job but sounds like the unit lives on.
The louvres fully open on start up so self resetting in that respect. It sounds like the motor itself is faulty or the louvre isn't actually located inside it correctly. Obviously there are gears but they don't get stripped as such as the motor revolves with the louvres. Perhaps if the kids wanged them right round the motor innards are damaged though as you suggest, would have thought the louvre is quite floppy in that case. Might need it taken apart and fiddled with to see what goes.