How do I read the error code on a Fujitsu AC — the operation and timer lights are blinking a pattern?

Read it before you touch anything — that's the habit that saves a wasted call-out. Fujitsu doesn't put a code on a screen; like the General / O General units (same maker — Fujitsu General), it runs a self-diagnosis on the indicator lamps: the operation and timer lamps blink a pattern, and the combination and number of flashes IS the code. So step one is to video or photograph the full sequence — which lamps, how many flashes each, and the gap before it repeats — before you clear anything.

The honest caveat: the lamp patterns map differently across Fujitsu General's series, so the only real authority is your unit's own service manual — match your model number (the side sticker) to the manual via Fujitsu General's official site. Skip the generic "Fujitsu blink code" lists online; they mix series (and the General / O-General variants) and contradict each other, which is how the wrong part gets replaced.

For what you can clear yourself versus what needs a pro, judge by the symptom, not a guess at the count. If it clears on a clean power-cycle (off at the isolator for a few minutes, then back on) and cools normally afterwards, it was most likely a transient protection trip. But if the blinking comes with no cooling, ice on the pipework, the outdoor unit not starting, or it returns the moment you reset it, that is a sensor, pressure, compressor or board fault — stop running it, because forcing a unit through a genuine protection trip is how a compressor dies. Same read-the-code-first logic as the O General thread (same manufacturer, same lamp method), the Hitachi thread and the general error-code guide. If the pattern keeps returning after a clean restart, Al Ghubaiba's AC technicians can meter it and confirm what is actually tripping. Photograph the sequence before you clear it.