General Assist Troubleshooting Guide
All Three Lights Flashing and Air Conditioner Not Starting
How to check and cancel an accidentally activated Weekly Timer
For compatible Fujitsu General high-wall split systems using a wireless remote controller
If all three indicator lights flash several times, then switch off, and the air conditioner will not start from the remote controller, the Weekly Timer may have been activated accidentally. This can often be resolved by cancelling the timer from the wireless remote controller.
Important: Flashing indicator lights can also be used to report faults. Use this guide when the remote controller displays WEEKLY and the light pattern matches the description above. If the lights continue flashing after the timer is cancelled, further diagnosis may be required.
1. Why this happens
On compatible models, an active Weekly Timer can prevent the unit from operating in the way expected from a normal manual ON command.
Check the wireless remote controller display. If the word WEEKLY is visible, the Weekly Timer is active.
Typical indication:
- The air conditioner does not start.
- All three indoor-unit indicator lights flash several times and then turn off.
- The remote controller display shows WEEKLY.
2. How to cancel the Weekly Timer
| 1 | Open the remote-controller cover. Slide down or lift the cover, depending on the remote model, to access the additional timer buttons. |
| 2 | Check for WEEKLY. Confirm that WEEKLY is shown on the remote-controller display. |
| 3 | Cancel the timer. Press the WEEKLY button to turn the Weekly Timer off. On some remote controllers, the timer may need to be cancelled using the timer mode or cancel button specified in the operating manual. |
| 4 | Confirm the display. The word WEEKLY should disappear from the screen. |
| 5 | Restart the air conditioner. Press the ON/OFF button and allow the unit a short time to respond. |
Before using RESET: The RESET button may clear the clock, timer schedules and other remote-controller settings. Use it only when the normal timer-cancel procedure does not work, then reset the date and time if required.
3. If the problem continues
- Confirm that WEEKLY is no longer shown on the remote-controller display.
- Check that the remote-controller batteries are installed correctly and have sufficient charge.
- Turn the air conditioner off at its dedicated power supply or isolator for approximately 30 seconds, then restore power.
- Wait several minutes and try the ON/OFF command again.
- Observe and record the exact indicator-light sequence, including which lights flash and how many times.
Service may be required when:
- The indicator lights continue flashing after the Weekly Timer has been cancelled.
- The lights repeat a consistent flash pattern.
- The unit starts and then stops again.
- A circuit breaker or safety device operates.
- There is an unusual smell, sound, water leak or visible damage.
4. Information to provide when requesting support
| Information | Where to find it |
|---|---|
| Indoor and outdoor model numbers | On the rating labels attached to the units. |
| Indicator-light sequence | Record which lights flash, the number of flashes and whether the pattern repeats. |
| Remote-controller display | Note any timer symbols, operating mode, temperature or error indication. |
| Recent changes | Advise whether batteries, timer settings, power supply or Wi-Fi controls were recently changed. |
Key takeaway: When the remote controller displays WEEKLY, cancel the Weekly Timer first. If the light sequence remains after cancellation and a power reset, record the exact pattern and arrange further technical support.
Button names and timer-cancellation steps can vary between remote-controller models. Refer to the operating manual supplied with the air conditioner where the controls differ from this guide.