For stationary refrigeration, air conditioning and heat pump work in Great Britain, Category 1 is the broadest of the four certificate categories described in current GOV.UK guidance. It covers the listed F-Gas activities without the refrigerant-charge limits that restrict Categories 2 and 3. It does not, by itself, authorise every aspect of an installation or replace company certification.
This explanation concerns the GB framework. Northern Ireland operates within a different F-Gas regulatory context, and EU work has separate recognition requirements. Confirm the rules for the location and activity before accepting a contract. Regulatory sources were checked on 8 November 2026.
What the certificate covers
The official qualifications guidance identifies the activities requiring qualifications and describes Category 1 as covering all the listed RACHP activities. Broadly, that includes installation, maintenance and servicing, leak checking, recovery and decommissioning within the relevant equipment scope.
An engineer should read the actual certificate and confirm its scope with the issuing body where uncertain. A stationary RACHP qualification should not be assumed to cover unrelated equipment sectors. Nor should the category number be treated as proof of experience with every refrigerant, system design or manufacturer.
How the categories differ
The key distinction is the range of activities and, for some categories, the refrigerant quantity. The official guidance should remain your reference for detailed applicability.
- Category 1 covers the listed activities without the Category 2 and 3 charge restrictions.
- Category 2 covers installation, maintenance, servicing and recovery within its restricted charge scope: less than 3 kg, or less than 6 kg for hermetically sealed systems, as described by GOV.UK.
- Category 3 is limited to recovery within those charge restrictions.
- Category 4 covers leak checking that does not involve breaking into the refrigerant circuit.
Do not confuse charge limits expressed in kilograms with leak-check thresholds expressed in other terms. They answer different regulatory questions. If a specific task falls near a certificate boundary, ask the certification body rather than relying on a simplified comparison.
Personal qualification and company certification
Your individual qualification establishes your certificate scope. A business working on equipment operated by others may also need company certification. These are separate requirements: employing a qualified engineer does not automatically certify the company, and a company's certificate does not replace its engineers' qualifications.
GOV.UK's company certification guidance includes sole traders and sets out the activities and business arrangements it covers. Check the business certificate, its scope and validity before trading. The guidance also explains the distinction when a business services only its own equipment; individual qualifications still matter.
What Category 1 does not demonstrate
A refrigerant-handling certificate is not a general electrical licence, a heating-system design qualification or manufacturer approval. Working on flammable refrigerants introduces additional hazards and equipment requirements; the presence of an F-Gas certificate does not establish that those needs have been addressed.
You must still assess your competence for the actual work. Consider safe isolation, pressure systems, access, refrigerant properties, tools, site conditions and the manufacturer's instructions. Where a job requires other trades or specialist design input, organise that support rather than stretching the certificate into a wider claim.
Qualification is the beginning of practical development
An assessment cannot reproduce every site condition. If you have passed but lack experience with a particular procedure, building confidence after qualifying is a practical development issue, not a reason to disregard your limits.
Regular work also matters. Someone returning to refrigeration after a long break may need supported practice with current instruments and equipment. Refresher coaching can target these gaps, but it should not be described as automatically renewing a certificate or changing its category.
Check location, recognition and current rules
Before working across borders, confirm recognition directly with the relevant authority or certification body. The GOV.UK F-Gas collection explains that Northern Ireland is part of the EU F-Gas system. Do not assume that GB arrangements can be transferred unchanged.
For EU work, GOV.UK states that UK individual and company F-Gas certificates are not valid; recognised EU qualification and certification arrangements are needed where relevant. Northern Ireland guidance is available from DAERA. Check current advice before committing to work, particularly where a customer or contractor operates in more than one jurisdiction.
A practical check before accepting a job
Identify the equipment sector, refrigerant and proposed activity. Confirm your certificate scope, any required business certification and the rules for the location. Then assess whether you have the practical competence, equipment and other support to carry out the task safely.
If the certificate scope is suitable but practical experience needs strengthening, explore F-Gas 1's on-site coaching. Ask for support around a defined task and system type. Keep legal eligibility, technical competence and business certification as three checks that all need satisfactory answers.
