LCL Awards CMDDA1 Domestic CO/CO2 Atmosphere & Appliance Testing (Natural Gas) Course
The CMDDA1 (Domestic CO/CO₂ Atmosphere & Appliance Testing) qualification enables gas engineers to safely and competently assess carbon monoxide (CO) and carbon dioxide (CO₂) levels in domestic premises using portable electronic analysers, and to undertake combustion testing where fumes, smells or combustion product concerns are reported.
It is essential for operatives responding to CO alarm activations or suspected leakage of combustion products in domestic settings
Why Take the CMDDA1 Qualification?
The LCL Awards CMDDA1 CO/CO₂ Atmosphere & Appliance Testing qualification aligns with industry-recognised standards and ACS criteria for safe domestic gas work. It demonstrates your capability to accurately conduct carbon monoxide and carbon dioxide testing using portable combustion analysers, ensuring the safety of occupants and compliance with UK gas safety guidance.
Training and assessment provided by PASS means you’ll benefit from expert assessors with real-world industry experience, dedicated training facilities, and tailored support that helps you prepare confidently and perform effectively in assessment conditions.
What does the CO/CO₂ Atmosphere & Appliance Testing course cover?
This assessment tests your ability to safely carry out CO and CO₂ atmosphere testing and combustion performance analysis in domestic dwellings following indications of fumes, smells or activated CO alarms.
Topics & Syllabus
The CMDDA1 syllabus is designed to assess real-world investigative and testing competence using industry-standard procedures and equipment and includes:
- Conducting ambient CO and CO₂ atmospheric testing
- Identifying combustion product leakage and potential causes
- Using portable electronic combustion analysers
- Interpreting the analyser results to assess safety
- Following BS EN 7967 Part 1–4 guidance and HSE recommendations
- Reporting outcomes and documenting findings
It certifies your ability to safely test for carbon monoxide and carbon dioxide in gas appliance atmospheres, essential for ensuring compliance and safety.
Gas engineers, heating engineers, and technical professionals working with gas-fired appliances requiring combustion gas testing.
Yes, a core ACS qualification or equivalent is recommended before taking CMDDA1.
Yes, reassessment courses are offered to maintain your CMDDA1 certification and update your knowledge.
You will use calibrated combustion gas analysers and atmosphere testing devices as part of the practical training.
24 hours (Mon-Fri).
