Narrow it down

Is the affected fan turning at all?

Watch and listen from a safe distance only. Never reach into a unit or touch a fan — it can start without warning.

No — it does not turn at all Fan does not turn
It tries to start, then stops Fan attempts to start then stops
It turns, but slowly or unevenly Fan turns slowly or unevenly
It seems to turn normally Fan appears to turn normally
I cannot see it safely Fan movement could not be observed safely

From where you can safely see, is anything in or against the fan?

Look only — through the outdoor unit's guard, or at the indoor unit's vents and filter cover. Do not open panels, remove guards or move anything.

Yes — there is visible debris or something touching the blade Visible obstruction reported
The coil or vents look heavily dust-blocked Heavy dust or coil fouling observed
Nothing visible No visible obstruction found
I could not see safely Visual inspection not possible safely

Is there any unusual noise or vibration from that unit?

Grinding, scraping, rattling or a fan that sounds like it is straining are all worth recording, and so is a unit that has gone unusually quiet.

Grinding, scraping or rubbing Grinding or scraping noise reported
Rattling, or noticeable vibration Rattling or abnormal vibration reported
A hum or buzz with no rotation Hum or buzz without rotation
It has gone silent — no fan sound at all No fan sound at all
Nothing unusual No abnormal noise reported

Is air still coming out of the indoor unit?

Only relevant where the code refers to the indoor fan — the fan you can feel.

No airflow at all No indoor airflow
Much weaker than normal Reduced indoor airflow
Airflow seems normal Indoor airflow appears normal
I'm not sure Indoor airflow not established

When does the error appear?

Immediately on starting, and only after running for a while, point at different possible causes.

Immediately when it starts Error appears immediately on starting
After it has been running a while Error appears after a period of running
At random — it comes and goes Error is intermittent
I'm not sure Timing pattern not established

Did this start after any work on the system?

Fan connectors and feedback plugs are routinely disturbed during cleaning and board work.

After servicing or a coil / filter clean Followed servicing or cleaning
After wiring or electrical work Followed wiring or electrical work
After a board or motor replacement Followed a board or motor replacement
No work at all — it appeared on its own No recent work reported
I'm not sure Recent work history unknown

If it has been switched off and on again, what happened?

Switch off at the wall or breaker only, wait ten minutes, then switch back on. Do not keep resetting a system to force it to run.

The code came straight back Code returns immediately after a restart
It cleared for a while, then returned Code clears temporarily then returns
It has run normally since Normal operation since the restart
It has not been switched off and on Restart not attempted

About Fujitsu General E:12

The indoor unit reported that its own fan did not run as expected, so it stopped rather than trying to cool a room it cannot move air into.

How to read this diagnosis

Everything here is a possible cause and a likely area to inspect, based on your answers — it is not a confirmed diagnosis.
One code may indicate more than one fault, so a technician would typically verify the suspected area by measurement before any part is replaced.
Manufacturer documentation should be checked for model-specific values: we do not publish voltages, pressures or resistance figures we cannot source for your exact model.

What you can check, and what needs a technician

Safe to check yourself

Confirm the exact code as it is displayed, and note which unit and which display is showing it.
Observe whether the affected fan turns at all, tries to start and stops, or turns slowly — from a safe distance, without opening anything.
Listen for grinding, scraping, rattling or straining, and note whether the unit has instead gone silent.
Note whether air is still coming out of the indoor unit, and check accessible filters and vents for obvious blockage where you can reach them safely.
Look through the outdoor unit's fan guard for obvious debris, and check the coil face and the space around the unit are not blocked. Look only — never put anything through the guard.
Note whether the problem began after servicing, cleaning, wiring work or a part replacement.
Switch the system off at the wall or breaker once, wait ten minutes, switch it back on, and note whether the code returns immediately, later, or stays away.
Record the indoor and outdoor model numbers before calling anyone: fan acceptance values are model-specific and a technician needs them.
Because this code refers to the fan you can feel, note whether any air at all comes from the unit and whether the sound of the fan changed before the code appeared.

Do not

Do not put your hand, a stick or any tool through a fan guard, and do not spin a fan blade by hand — a fan can start without warning even when the unit appears idle.
Do not remove fan guards, grilles or unit panels to get a better look.
Do not test or discharge capacitors, and do not measure voltage, motor windings or board outputs — this work sits behind stored energy and mains voltage.
Do not bypass, jumper or disconnect a fan feedback plug to try to make the system run.
Do not run the system with a fan that is not working properly: the rest of the system takes the load, which can turn a fan fault into a larger repair.
Do not repeatedly reset the system to clear the code; clearing it without diagnosis hides the fault rather than resolving it.

Technician verification sequence

For the attending technician — these steps involve live equipment or sealed systems and are not homeowner checks.

Confirm the exact model and the manufacturer's meaning for the displayed code — fan code maps differ between model generations.
Isolate the unit, then inspect the fan assembly for obstruction, debris, blade contact, imbalance and bearing drag, and confirm it turns freely.
Inspect the fan harness and its connectors for chafing, pinching, heat damage, corrosion and partial seating.
Verify the fan command and the feedback signal according to the manufacturer's documentation for that model, rather than against generic figures.
Inspect the rotation feedback circuit where the model uses one — a fan that turns while the board reports a fault points there.
Verify motor operation according to the manufacturer's procedure, including the motor's own electronics where it is an electronically driven fan.
Assess airflow and loading — filters, coil condition, duct or condenser restriction — so a fan reporting a real condition is not mistaken for a failed fan.
Inspect the board's fan-drive circuit only once the fan, its harness and its feedback path have tested correctly.
Replace only the item proven faulty by diagnosis, then confirm the fan runs and reports correctly and the code stays clear.
Inspect the blower wheel and its housing for debris, imbalance and bearing drag before the motor is treated as the fault.
Confirm whether the unit uses the current E:xx code set or the legacy two-character set before reading the code against documentation — the maps differ.

About resetting

Switching the system off at the wall or breaker, waiting ten minutes and switching it back on is reasonable once. How quickly the code returns is itself diagnostic information.

When not to reset: Do not keep resetting it. A fan code that returns is reporting something real, and running the system with a fan that is not working properly puts avoidable load on the compressor and the coil.

What this code can point to

Physical obstruction in or against the fan Most likely: Debris, packaging, a bird's nest, construction dust or something resting against the blade can hold a fan back or stop it outright. It is a possible cause worth inspecting first because it is visible and costs nothing to correct.
Poor connector contact at the fan plug Most likely: A fan plug that is loose, partly unseated, corroded or heat-affected interrupts either the drive to the motor or the signal back from it, with nothing visibly wrong at the motor.
A real airflow condition loading the fan Most likely: Blocked filters, a dirty coil, closed or restricted air paths and a fouled condenser face can load a fan enough that what the board measures sits outside what it expects. Here the fan is reporting a real condition and something else needs attention.
Fan rotation feedback circuit fault Likely: Many fans report their rotation back to the board. If that signal is lost, the board records a fan fault even where the fan is physically turning — which is why whether the fan moves is one of the first questions asked.
Fan assembly mechanical restriction Possible: A blade fouling its housing, a loose or out-of-balance wheel, or worn bearings make the fan stiff to turn. That may indicate a fan assembly problem rather than a failed motor winding.
Fan wiring or harness fault Possible: Chafed, pinched, rodent-damaged or heat-embrittled fan wiring is a likely area to inspect, particularly where the fault comes and goes.
Fan motor electronics fault Possible: An electronically driven fan motor carries its own drive electronics. Those can fail while the motor's mechanical side is sound, and they are verified according to the manufacturer's procedure rather than by appearance.
Fan motor fault Possible: The motor itself may be at fault — but a technician would typically verify that once obstruction, wiring, the connector and the feedback path have been checked, because a motor replaced on assumption often leaves the fault in place.
Control board fan-drive circuit fault Less common: The board's own fan-drive output can fail to drive a healthy motor, or misread a healthy feedback signal. This is a possible cause a technician would typically verify last.
Control or drive signal fault Less common: On electronically controlled fans the code may describe the control path to the fan rather than the fan itself — the signal that tells it how fast to run.
Model-specific condition needing further diagnosis Less common: Some fan codes carry model-specific behaviour and acceptance windows. Where that applies, the exact model's manufacturer documentation decides what the code means.

Which fan this code refers to

Indoor fan (blower) motor circuit. In the indoor unit, moving room air across the coil — the fan you normally hear and feel.

An indoor fan fault usually shows as little or no airflow from the unit, and the system often stops shortly afterwards because it cannot move heat out of the room without the fan.

Common questions

What does Fujitsu General E:12 mean?

E:12 on a Fujitsu General system points at Indoor fan (blower) motor circuit. The indoor unit reported that its own fan did not run as expected, so it stopped rather than trying to cool a room it cannot move air into. In the indoor unit, moving room air across the coil — the fan you normally hear and feel. The board either drove the fan and did not see the result it expected, or did not receive a valid signal that the fan was turning, and stopped rather than continuing without airflow. The code identifies the circuit, not the component that failed.

Which fan does Fujitsu General E:12 refer to?

Indoor fan (blower) motor circuit. In the indoor unit, moving room air across the coil — the fan you normally hear and feel. That is what separates E:12 from Fujitsu General's other fan codes: the fan it names decides what you can observe safely and where a technician looks first.

Does Fujitsu General E:12 mean the fan motor is bad?

Not on its own. An obstruction, a stiff fan assembly, a connector, the harness, the rotation feedback signal, the motor's own electronics and the board's fan-drive circuit can all raise E:12. A technician would typically verify the motor by diagnosis, because a fan motor replaced on assumption often leaves the fault in place.

Can a blocked or dirty fan cause Fujitsu General E:12?

Yes, and it is one of the first areas to inspect. Debris in the fan guard, something resting against the blade, or a coil and air path heavy with dust can hold a fan back or load it enough that the board rejects what it measures — which in Dubai's dust is a genuinely common possible cause.

Can wiring cause Fujitsu General E:12?

Yes. A partly seated fan plug, or chafed, pinched or heat-damaged fan wiring, interrupts either the drive to the motor or the signal back from it. It is a likely area to inspect where the fault is intermittent or followed servicing or electrical work.

Can the PCB cause Fujitsu General E:12?

It can: the board's fan-drive output can fail to drive a healthy motor, or misread a healthy feedback signal. A technician would typically verify that last, once the fan, its harness and its feedback path have tested correctly.

Can I run the AC with Fujitsu General E:12?

It is not advisable. Without the fan turning properly the system cannot move heat, so it will usually stop or protect itself — and where it does keep running, the compressor and the coil take the load, which can turn a fan repair into a larger one.

Can I reset Fujitsu General E:12?

Switching off at the wall or breaker, waiting ten minutes and switching back on is reasonable once. If the code returns straight away it is a live fault; repeated resetting only removes the history a technician would use.

What can I safely check myself?

Whether the fan turns at all, tries to start and stops, or turns slowly; whether there is grinding or rattling; whether air still comes from the indoor unit; whether anything is visibly blocking the fan guard, vents or coil; and whether the problem started after work on the system. Never put anything through a fan guard or spin a blade by hand.

How does a technician diagnose Fujitsu General E:12?

By confirming the code against the documentation for your exact model, isolating the unit and inspecting the fan assembly for obstruction and mechanical restriction, checking the harness and connectors, verifying the fan command and feedback signal according to the manufacturer's procedure, assessing airflow loading, and only then testing the board's fan-drive circuit. We do not publish speed, voltage or resistance figures, because they are specific to your model.

Did this help you find the fault?

Sources consulted

Fujitsu General official-style ARMA technical troubleshooting PDF
Fujitsu UK webstore fault-code PDF and Orionair troubleshooting guide (mutually consistent)

Fujitsu General E:12: guided diagnosis