Question 1

Error Red LED turning on ("ef. 3"): Detector malfunction

Accepted Answer

Possible cause: The detector's own electronics or sensor have developed a fault. Replace the device.

Question 2

Error Red LED flashing 1 time every 2 seconds ("ef. 3"): LPG or soporific gas concentration in the air has crossed the alarm threshold, with an intermittent buzzer sounding

Accepted Answer

Possible cause: Presence of LPG or soporific gas in the air exceeding the threshold. Work out what's causing the alarm and remove it. Put out any naked flames and turn off gas appliances, ventilate the room thoroughly, and shut off the gas supply at the tank's main valve. Don't switch on any electrical appliance. If you can't identify the cause, leave the room and call the emergency services.

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`Red LED turning on ("ef. 3")`	Detector malfunction	The detector's own electronics or sensor have developed a fault	Replace the device.	DIY Safe
`Red LED flashing 1 time every 2 seconds ("ef. 3")`	LPG or soporific gas concentration in the air has crossed the alarm threshold, with an intermittent buzzer sounding	Presence of LPG or soporific gas in the air exceeding the threshold	Work out what's causing the alarm and remove it. Put out any naked flames and turn off gas appliances, ventilate the room thoroughly, and shut off the gas supply at the tank's main valve. Don't switch on any electrical appliance. If you can't identify the cause, leave the room and call the emergency services.	Professional Intervention Required

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Master Troubleshooting & Diagnostics Matrix