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AOV Service

AOV servicing with testing, certification & reporting

Install, repair and service of all AOV systems — including Velux, Ventec, S E Controls, Window Master, Dyer, Easivent and SCS. Emergency call-outs typically responded to within 24 hours.

Common AOV faults

What we look for on a service visit

From stuck vents and faulty motors to control panel fault codes — our engineers diagnose and fix issues across every major AOV system on the market.

What we do

Service & repair for any AOV system, any manufacturer

BLEC Group install, repair and service all types of AOV systems — including those manufactured by Velux, Ventec, S E Controls, Window Master, Dyer, Easivent and SCS. Whether we installed your system or someone else did, we can service it.

We can normally respond to an emergency call-out within 24 hours, so we can have your system up and running without inconvenience — helping you make sure that your premises are safe again.

Systems we service

Where we operate

We service AOV systems across the following areas: London, Devon, Cornwall, Bristol, South Wales, Oxfordshire, Hampshire, Hertfordshire, Middlesex and Surrey. If your property sits outside these regions, get in touch — we can usually still help.

Typical faults we fix

Most call-outs we get fall into one of these common issues. If you’re seeing any of these on your system, give us a call:

One-visit fix where possible

All of our fully qualified engineers carry a stock of the most common replacement parts — back-up batteries, manual call points and smoke detectors — so that the repair can often be completed during a single visit.

When that’s not possible, we’ll provide a written, accurate repair quotation including parts, labour and correct lead times, so you can have your system up and running as soon as possible.

Why choose BLEC for AOV servicing

Fast response, stocked parts, qualified engineers

Six things that come as standard on every BLEC service visit — whether it’s a planned annual or an emergency call-out.

24-hour response

Emergency call-outs typically responded to within 24 hours — so your system is back up and running with minimum downtime.

Stocked parts on vans

Every engineer carries common spares — backup batteries, manual call points, smoke detectors — so most faults are fixed in one visit.

Fully qualified engineers

All BLEC engineers are directly employed, trained on every major AOV system, and accredited to BAFE standards.

Any manufacturer

Velux, Ventec, S E Controls, Window Master, Dyer, Easivent, SCS — we hold manufacturer contracts so we can work on any system.

Written quotes

If parts are needed beyond what's on the van, you get a written quote with parts, labour and clear lead times. No surprises.

10-region UK coverage

Active service contracts across London, Devon, Cornwall, Bristol, South Wales, Oxfordshire, Hampshire, Hertfordshire, Middlesex and Surrey.

Related compliance services

One team, end to end — AOV is just one part of what we look after for property managers.

AOV Servicing

Scheduled servicing to keep your AOV system fully compliant and operational. Annual contracts available.

AOV Maintenance

Reactive and planned maintenance for AOV systems — fault diagnosis, repairs, and full system overhauls.

Fire Alarm Installation

Pair your AOV with a BS 5839-compliant fire alarm system for full smoke detection & control coverage.

Client Feedback

Trusted by the UK's leading block managers.

Real reviews from the property managers, estate agents and freeholders we serve nationwide.

Common Questions

AOV service questions answered.

The questions we get asked most often when property managers are scoping a service contract or booking a one-off call-out. If yours isn’t here, just call or drop us a line.

Still have questions?

Our team responds to enquiries within one working hour during business hours.

Call us · 01752 659415 →

How quickly can you get to an emergency call-out?

We can normally respond to an emergency call-out within 24 hours — often faster if you’re in our core regions. If you’ve got a contract with us, response times are guaranteed in the SLA.

Do you service AOV systems you didn't install?

Yes — that’s a big part of what we do. We hold contracts with all the major manufacturers: Velux, Ventec, S E Controls, Window Master, Dyer, Easivent and SCS. If your system is from any of those, or any other UK manufacturer, we can service it.

How often should an AOV system be serviced?

BS 7346-8 recommends a weekly visual check by the building’s responsible person and a full annual service by a competent engineer. Most of our contracts cover the annual service plus reactive call-out cover for the rest of the year.

Will I get a fixed quote before any repair work starts?

If the repair can be completed during the visit using parts our engineer has on the van, we’ll do it on the spot. If not, we’ll provide a written, accurate repair quotation including parts, labour and lead times — no surprises, no over-runs.

What does a typical service visit involve?

A full service typically takes 1–2 hours per system and covers: roof vent inspection (mechanical and seals), control panel fault-code check, battery load test, smoke detector trigger test, manual call point function check, and full open/close cycle test of the vents. You get a written service report at the end.

My AOV control unit is beeping — is it urgent?

A beeping control panel usually indicates a fault that needs attention — most commonly a low-battery warning, a system mismatch, or a detector issue. It’s not immediately dangerous but the system may not operate correctly in a fire, so it should be looked at quickly. Call us and we’ll usually be on-site within 24 hours.