Deadlines & standards
When do fire detectors have to be replaced?
Automatic detectors age and become contaminated. To keep a fire alarm system reliable, the standards prescribe fixed replacement intervals.
The replacement intervals
5 years
Without contamination compensation
According to DIN 14675-1, point-type smoke detectors – including multi-criteria detectors with an optical component – without contamination compensation must be replaced or refurbished at the manufacturer’s factory after no more than five years of operation.
8 years
With automatic compensation
According to DIN 14675-1, point-type smoke detectors with contamination compensation or automatic calibration and self-monitoring may be used for up to eight years of operation.
8 years
Fire warning systems to DIN VDE V 0826-2
In fire warning systems too, such as those used in smaller special-use buildings, the smoke detectors must be replaced after eight years at the latest. In addition, regular inspections and annual servicing by a specialist company are required.
Which rules apply?
The relevant standards are DIN 14675 (planning, installation and operation of fire alarm systems) and DIN VDE 0833-1/-2 (maintenance). In addition, the specifications of the detector manufacturer and the requirements of the building permit and fire protection concept apply. For fire warning systems, the pre-standard DIN VDE V 0826-2 applies.
Why replacement matters
- Contaminated detectors may detect fires with a delay.
- Ageing sensors trigger false alarms more frequently – with costs for fire brigade call-outs.
- Overdue detectors are noticed during the periodic inspection by approved inspection experts.
Standards and sources
- DIN 14675-1 Fire alarm systems – Part 1: Design and operation (replacement intervals in section 11.5.3) and DIN 14675-2 (requirements for specialist companies) – DIN Media
- DIN VDE 0833-1/-2 Alarm systems for fire, intrusion and hold-up (maintenance) and DIN VDE V 0826-2 Fire warning systems – VDE VERLAG
- DIN EN 54 Parts 5 to 31 (product standards for fire detectors) and DIN 14676 / DIN EN 14604 (smoke alarms) – DIN Media
- Manufacturer specifications and data sheets of the respective detector manufacturers – see detector pages
- Legal basis (PrüfVO NRW, BauO NRW, VVG, etc.) with links to the legal texts – see Legal situation
Standards are protected by copyright and available for a fee. We reproduce their content only in paraphrased form and in extracts; the version currently in force is authoritative. Information last updated: 19.10.2026.
Note: This page provides a general overview and does not replace an inspection of your individual system.
Detector types according to EN 54
Which detectors are affected?
The replacement requirement under DIN 14675-1 (section 11.5.3) applies to point-type smoke detectors – in particular detectors with an optical measuring chamber – and to the measuring chamber or sensor system of aspirating smoke detectors. This also includes multi-criteria detectors with an optical component. Detectors that work without a smoke measuring chamber are not subject to the fixed replacement cycle; for them, the annual test and the manufacturer’s specifications apply.
| Detector type | Product standard | Replacement according to DIN 14675-1? |
|---|---|---|
| Point-type heat detector (fixed-temperature/rate-of-rise) | DIN EN 54-5 | No – annual function test |
| Point-type smoke detector, optical (scattered light) | DIN EN 54-7 | Yes – 5 or 8 years |
| Point-type smoke detector, ionisation | DIN EN 54-7 | Yes – 5 or 8 years (rarely installed today) |
| Explosion-protected smoke detectors (Ex) | DIN EN 54-7 or -29 + ATEX | Yes – same as the respective basic type |
| Flame detector (IR/UV) | DIN EN 54-10 | No – inspection and cleaning of the viewing windows as specified by the manufacturer |
| Manual call point (push-button) | DIN EN 54-11 | No – not an automatic detector |
| Linear beam smoke detector (light beam) | DIN EN 54-12 | No – no fixed replacement cycle; annual function test (e.g. with a test filter), cleaning of the optics and alignment as specified by the manufacturer |
| Multi-criteria detector with optical component (general) | DIN EN 54-15 | Yes – 5 or 8 years |
| aspirating smoke detectors (ASD) | DIN EN 54-20 | Yes – measuring chamber or sensor system |
| Linear heat detector, resettable (sensor cable, sensor tube) | DIN EN 54-22 | No – inspection as specified by the manufacturer |
| Wireless smoke detector (wireless components) | DIN EN 54-25 and DIN EN 54-7 | Yes – 5 or 8 years; batteries as specified by the manufacturer |
| Wireless heat detector | DIN EN 54-25 and DIN EN 54-5 | No – annual function test; batteries as specified by the manufacturer |
| CO detector | DIN EN 54-26 | No – sensor service life as specified by the manufacturer |
| Duct smoke detector | DIN EN 54-27 | Yes – smoke detector/measuring chamber 5 or 8 years |
| Linear heat detector, non-resettable (heat-sensitive cable) | DIN EN 54-28 | No – to be renewed after activation |
| Multi-criteria detector smoke + heat (O/T) | DIN EN 54-29 | Yes – 5 or 8 years |
| Multi-criteria detector CO + heat | DIN EN 54-30 | No – sensor service life as specified by the manufacturer |
| Multi-criteria detector smoke + CO (+ heat) | DIN EN 54-31 | Yes – 5 or 8 years |
| Smoke detectors in fire warning systems | DIN VDE V 0826-2 | Yes – after 8 years at the latest |
| Smoke alarms (dwellings, not a fire alarm system) | DIN EN 14604 | Under DIN 14676, after 10 years at the latest |
As an alternative to replacement, the affected detectors can be sent to the manufacturer for factory testing and refurbishment. Cleaning on site does not extend the deadline.
Start of the interval
Operating time, not date of manufacture
The intervals of 5 and 8 years respectively refer to the operating time of the detectors in the system – not to the date of manufacture. What counts, therefore, is how long a detector has actually been in use.
Important from our practical experience: the operating time also includes the period in which the detectors were already installed and in operation before the official commissioning or before the acceptance inspection by approved inspection experts – for example during the construction phase. It is precisely there that the detectors are particularly exposed to dust and dirt. You should therefore plan the replacement from the time of installation and not only from the acceptance inspection. For how to plan the replacement in good time, see Plan early.
In fire warning systems to DIN VDE V 0826-2, the smoke detectors must be replaced after 8 years at the latest.
Legal situation & liability
Who is liable for overdue detectors? What are the consequences with regard to insurance, the building control authority and criminal law – and who is actually permitted to replace detectors? You will find everything on this on the page Legal situation.
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