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Serial reverse signal error, at operation start up

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Fujitsu asta12lcc timer flashes 5 times


From the service manual:

Serial forward transfer error during the operation
When the outdoor unit does not receive the signal for 10 consecutive seconds during the operation > Outdoor unit stops.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)

Jan 17, 2017 | Fujitsu Heating & Cooling

1 Answer

What does 3 green led flashes in sequence, operation led off mean on Fujitsu ASTA09LCC aircond


This means a "Serial reverse transfer error during the operation"
Diagnosis:
When the indoor unit does not receive the signal for 10 consecutive seconds during the operation
>Permanent stop after 30seconds.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)

This is generally caused by a faulty controller board in the outdoor unit. Often they are shorted out by geckos or bugs but sometimes a power surge.

Jul 14, 2015 | Fujitsu Heating & Cooling

1 Answer

I have two flashes on the timer light of my indoor unit of Fujitsu Inverter ASU9RLS


Serial signal (reverse) error, at operation start up. operation led - off, timer led - 2 flashes, coil dry led - off, check wire between indoor and outdoor

Jul 10, 2015 | Fujitsu ASU9RLS2 Single Zone Wall Ductless...

1 Answer

What is the meaning of timer flashing twice in the indoor unit of fujitsu heatpump astb24ldc?


Need to check that models error codes but for most Fujitsu A/C's, that means a "serial signal reverse error at start up" which means your outdoor controller board is stuffed. Try turning the main power switch off for 5 minutes and then back on. If the error persists, you will need a new controller.

May 06, 2015 | Fujitsu Heating & Cooling

1 Answer

I have a fujitsu air con which is flashing 3 times on the timer. It runs for 10 seconds and then shuts down and then flashes 3 times. Model is a AOTR09LCC


Serial signal (reverse) error, during operation.
Try turning power off at isolator for ten minutes and then switch back on. If error code persists, you will probably need a new controller PCB in the outdoor unit.

When the indoor unit does not receive the signal for 10 consecutive seconds during the operation >Permanent stop after 30 seconds.
[Diagnosis Point]
Check the indoor /outdoor cable connection (in order). If the cable wiring is not abnormal, measure the voltage of the outdoor
unit terminals and diagnose the defective location.
(Refer to the after mentioned [Serial Signal Diagnosis] for the voltage measuring method and diagnosis method.)

Feb 19, 2015 | Fujitsu Heating & Cooling

1 Answer

HOW DO I FIX FUJITSU AOU24CL1 SERIAL SIGNAL (REVERSE) ERROR, AT OPERATION STARTUP


Outdoor controller circuit board sounds faulty. This error means that the indoor and outdoor units cannot communicate. Replace the outdoor controller in this case. Check if there are more than one outdoor PCB as others can be damaged as well.

Jul 25, 2014 | Fujitsu HALCYON AOU24CL1 Mini Split...

1 Answer

Repeating flash


Serial signal (reverse) error, at operation start up. Usually a faulty outdoor controller board but this one has about six PCB'S in the outdoor unit so your going to need a tech to look at it.

Jan 23, 2014 | Fujitsu Heating & Cooling

1 Answer

Timer light flashes twice on my asta09lcc but it wont work


If operation light is normal and timer light flashes twice, the error is:
Serial signal (reverse) error, at operation start up
Most likely a faulty outdoor controller PCB. Around $250 for new board plus labour.

Jul 09, 2012 | Fujitsu 18C1 Air Conditioner

2 Answers

What dose 3 blinks on a fujitsu asta18lcc


Return air sensor short circuit. Replace it. Thanks.

Feb 04, 2011 | Fujitsu 18C1 Air Conditioner

1 Answer

Keyocera 1820 balck & white copier error code C6400 on start up,


Zero-crossing signal problem
The engine PCB does not detect the
zero-crossing signal for the time specified
below. At power-on: 3 s Others: 5 s

That is what the code means in the service manual. However you can try a reset by doing the following. Press 10871087 to enter maintenance mode. Once in maintenace mode press 906 then follow the steps below

1. Press the start key.
2. Select the EXECUTE using the up/down cursor keys. It is displayed in reverse.
3. Press the start key to reset partial operation control. The maintenance mode is exited, and the machine
returns to the same status as when the power switch is turned on.

If you do not feel comfortable performing this operation, or the problem persists then call a technician immediately.

Jan 26, 2009 | Kyocera Copystar CS-1820 Black and White...

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