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3-PITIDOS-AMARILLO-48-S

Ei Electronics three yellow beeps on smoke alarm: end of life

Verified with sources2 sourcesReviewed Oct 4, 2026
Technician coming? See the 2 steps they must show you
Google Nest Protect smoke and carbon monoxide alarm with its light ring glowing blue
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Risk level

High

Professional inspection is recommended.

Urgency

High

Quick answer

Three beeps and three yellow flashes every 48 seconds on an Ei 600 or 3000 Series alarm mean it has reached the end of its life and the whole unit must be replaced. If it is a mains-powered model, the swap is a job for an electrician.

Safety first

Stop and check this first

  • Ei asks you not to take the alarm off its base and leave it idle because the beeping is annoying: replace it so you are not left unprotected.
  • On mains-powered models do not touch the wiring or the base: isolating and fitting are a job for an electrician.

Safe checks you can perform

  • Count the beeps and yellow flashes
  • Read the date label on the side or back
  • Find out whether it is battery or mains powered

Leave these tasks to a qualified professional

  • Do not attempt this professional task: Ei Electronics technical support enquiry
  • Do not attempt this professional task: Replacement by an electrician on mains models

What a technician must be able to justify

Technician visit

These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.

These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.

  1. Ei Electronics technical support enquiry

    What they doIf the alarm seems too new to be at end of life, Ei technical support reviews the case using the model and date.

    They must show youthe manufacture code and the date on the alarm label.

    In writingthe enquiry number and the warranty decision.

  2. Replacement by an electrician on mains models

    What they doOn the 3000 Series and other mains-powered Ei alarms, a qualified electrician isolates the supply and fits the new head on its base.

    They must show youthe mains voltage at the base and that the interconnection between alarms works with the new unit.

    In writingthe model fitted, its Replace By date and that every alarm passed the test.

Before accepting a part or repair

Nothing has been shown yet. Do not accept a part swap based on the code alone.

Follow these steps

Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.

  1. Count the beeps and yellow flashes

    No special tools

    Who:
    you, near the alarm for at least two cycles.
    How:
    check that it is three beeps with three yellow flashes repeating every 48 seconds; Ei assigns one to the backup battery, two to the sensor and three to end of life.
    Result that matters:
    being sure the warning is end of life.
    If there are three:
    the alarm has used up its life and needs replacing.
    If it is four beeps every 8 seconds:
    that is the dust compensation limit, which Ei covers separately.
    Evidence to keep:
    a video with sound of two full cycles.

    Evidence: Products FAQs

  2. Read the date label on the side or back

    No special tools

    Who:
    you, without opening the alarm.
    How:
    look for the Replace By date in month and year format and, below it, the manufacture code with year and week, which Ei illustrates with the example 24W13.
    Result that matters:
    confirming the unit's age and noting the model for the replacement.
    If the date has passed or is close:
    the warning matches the alarm's life.
    If the label shows a young unit:
    ask Ei support before throwing it away.
    Evidence to keep:
    a photo of the label with model, manufacture code and Replace By date.

    Evidence: Products FAQs

  3. Find out whether it is battery or mains powered

    No special tools

    Who:
    you, reading the model printed on the side.
    How:
    Ei describes the 3000 Series as mains powered with three indicator lights and an AudioLINK symbol, while the Ei650i runs on a non-replaceable 3 V lithium battery.
    Result that matters:
    knowing whether you can replace it yourself or need an electrician.
    If it is a battery Ei650i:
    replace it with a new alarm and test it with its button.
    If it is a 3000 Series unit wired to the mains supply:
    ask an electrician to do the swap.
    Evidence to keep:
    the exact model and power type written down.

    Evidence: Products FAQs · Ei650i Intelligent Optical Smoke Alarm Data Sheet RevM04

Still not solved

If the error persists, stop here. See what the technician must do and show you.

Where this code applies

A code is meaningful only inside the right product and version context.

Primary scope

System
HVAC
Brand
Ei Electronics
Product type
Smoke and CO alarms

Known code variants

  • Ei alarm chirp every 48 seconds
  • Ei detector de humo caducado
  • Ei Electronics detector cada 48 segundos
  • Ei Electronics three beeps yellow light
  • Ei Electronics tres pitidos luz amarilla
  • Ei smoke alarm replace by date
  • Ei3016 three chirps
  • Ei3016 tres pitidos
  • Ei650 end of life
  • Ei650 fin de vida

What it means

In Ei Electronics' product FAQs, three beeps and three yellow flashes every 48 seconds on 3000 Series and 600 Series devices mean the alarm has reached the end of its life and must be replaced. Many Ei alarms last 10 years and carry a date label showing 'Replace By'. One chirp is a low backup battery and two may point to a sensor fault. The pattern alone never proves which part has failed, and other Ei models may warn differently; until you replace it, the home may be unprotected.

Warnings and stop conditions

  • Highsource verified

    Ei asks you not to take the alarm off its base and leave it idle because the beeping is annoying: replace it so you are not left unprotected.

    Evidence: Products FAQs

  • Highsource verified

    On mains-powered models do not touch the wiring or the base: isolating and fitting are a job for an electrician.

    Evidence: Products FAQs

Symptoms and causes

Probable causes · in order

  • The 10-year life has been reachedCommon

    Ei explains that many of its alarms have a 10-year life span and must then be replaced to keep the home protected.

    Evidence: Products FAQs · Ei650i Intelligent Optical Smoke Alarm Data Sheet RevM04

  • The date on the label has passedCommon

    The side and back label shows the Replace By month and year; Ei notes this is the maximum life and the alarm should be replaced before it.

    Evidence: Products FAQs

  • A different warning miscountedPossible

    Ei uses similar patterns: one or two chirps every 48 seconds mean battery or sensor, and four beeps every 8 seconds mean the dust compensation limit.

    Evidence: Products FAQs

Virtual technician

Does 3-PITIDOS-AMARILLO-48-S still appear after these checks?

Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.

Start diagnosis

Sources and technical references

  1. 1

    Products FAQs

    Ei Electronics · 2026 · official_doc

  2. 2

    Ei650i Intelligent Optical Smoke Alarm Data Sheet RevM04

    Ei Electronics · 2025 · official_doc

Sources: Products FAQs · Ei650i Intelligent Optical Smoke Alarm Data Sheet RevM04reviewed 2026-10-04 · verified

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