Herman Miller Aeron Classic Gas Lift Replacement

If your Herman Miller Aeron chair is slowly sinking or no longer holding its height, the gas lift cylinder has likely failed. We provide a professional gas lift replacement service specifically for Aeron Classic chairs, restoring smooth and reliable height adjustment.

This service includes professional supply and fitting. If you are looking to purchase a replacement gas lift for self-installation, please refer to our Chair Parts section.

Important – Selecting the Correct Chair Size

The Herman Miller Aeron chair is manufactured in three sizes: A, B and C. Please ensure you select the correct size when purchasing or booking this service.

You can identify your chair size by checking the backrest. On the rear of the top edge of the chair there is a series of raised dots, similar to Braille:

• Size A – one dot

• Size B – two dots

• Size C – three dots

These dots are moulded into the frame and can usually be identified by touch. If you are unsure which size you have, please contact us before placing your order and we will be happy to assist.

Common Gas Lift Problems

Common signs of a failed gas lift include:

• Chair slowly sinks when sitting

• Height will not stay locked in position

• Jerky or inconsistent height adjustment

• Chair drops suddenly under weight

These are all typical signs that the gas cylinder requires replacement.

What is Included

This service includes:

• Removal of the existing gas lift cylinder

• Supply and installation of a high-quality replacement gas lift

• Correct fitting to Aeron Classic specification

• Height adjustment testing

• Stability and safety checks

Aeron Classic Compatibility

This service is specifically for the Aeron Classic model. The Herman Miller Aeron chair has different internal specifications depending on model and age, and not all gas lifts are interchangeable.

If you are unsure whether your chair is an Aeron Classic, please contact us and we will confirm compatibility before proceeding.

Service Process

Your chair is inspected on arrival to confirm the fault. The existing gas lift is removed using the correct tools to avoid damage to the base and mechanism before a replacement cylinder is installed and tested to ensure smooth operation and correct height adjustment.

For customers within our normal service area, most gas lift replacements can typically be completed within 1–2 working days. For customers outside these areas, repairs are scheduled around existing service routes and engineer availability, with appointments typically taking place within 1–2 weeks, depending on location and scheduling requirements.

All gas lift replacements are covered by a 12-month guarantee on both parts and labour.

On-Site Gas Lift Replacement for Commercial & Multi-Chair Repairs

For businesses, shared workspaces and commercial environments with multiple Herman Miller Aeron chairs requiring repair, we can offer on-site gas lift replacement services where suitable access and working space is available. This allows repairs to be carried out efficiently during a single visit, helping to minimise operational disruption and reduce the need for chair collection and transport.

On-site servicing is typically most suitable where multiple chairs require the same or similar repairs, including offices, studios, co-working spaces and managed workplace environments. For individual chairs or smaller domestic repairs, collection, drop-off or workshop-based repair options are generally the most practical and cost-effective solution.

We regularly support customers across Bedfordshire, Hertfordshire, Buckinghamshire and surrounding areas, with wider travel and commercial servicing possible depending on repair quantity, scheduling and location. For businesses operating within city centres, managed office buildings or restricted-access premises, early morning or pre-arranged servicing appointments may also be available depending on operational requirements.

Please contact us with your location, the number of chairs requiring repair, the repair required and any relevant site access restrictions, and we will confirm the most suitable servicing option along with availability and pricing.

Related Services

You may also be interested in:

• Aeron full service

• Aeron full refurbishment

Request a Quote

To arrange a gas lift replacement, please contact us with details of your chair and the issue you are experiencing. We will confirm compatibility and arrange collection, drop-off or transport options where required.