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ACS - CMDDA1 Carbon Monoxide/ Dioxide Atmosphere and Appliance Testing

The following training and assessment packages are certificated by LCL Awards to industry led standards.


Content type



Qualification Title:

ACS - CMDDA1 Carbon Monoxide/ Dioxide Atmosphere and Appliance Testing

LCL Qualification Code:


RQF Qualification Code:

Level and Credit Value:

Guided Learning Hours:

Qualification Units:

Qualification Certificate Expiry:

5 years


This gas safety assessment is designed to test the competence of an operative in determining ambient levels of CO and presence of CO2 in dwellings and identifying the cause of fumes using a portable electronic combustion analyser. This will typically be any engineer who responds to the genuine report of a CO alarm being activated or a report of fumes.

The scope of the assessment covers Type A, B & C domestic gas appliances fitted in dwellings and follows the guidance and procedures outlined in BS EN 7967 Part 1 to 4. Further guidance has also been issued by HSE in the form of HSE Guidance Notes HSE(EH)40 and HSE(L)56, Gas Safety (Installation & Use) Regulations. Further guidance is expected from IGEM in the near future.

It does not cover commercial premises and appliances or the procedures to adopt following an incident reportable under RIDDOR. Where an engineer is required to carry out a formal CO incident investigation on behalf of a gas supplier as part of their obligation under gas safety legislation, the engineer would need to have successfully achieved a relevant qualification in the investigation of CO poisoning and carry out the investigation in accordance with the Institution of Gas Engineers and Managers (IGEM) Industry Standard (IGEM/GL/8)

Learners outcomes:


CCN1/CCLP1 + CPA1) or CCN1/CCLP1 as from 1st April 2012 or valid equivalent NVQ or QCF qualification + appropriate domestic appliance(s)

This is regarded as having an equivalence to a Level 3 qualification.

Assessment method:
  • Assessment is carried out using a variety of assessment methods including multiple choice, short written response and scenario questions and observed practical assessment
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