Unit of competency details

CPCPGS4012A - Service Type A gas appliances (Release 1)


Usage recommendation:
Supersedes CPCPGS4002A - Service Type A gas appliancesPrerequisite unit (x2) requirement removed from unit Unit outcome altered Not equivalent to CPCPGS4002A 20/May/2011
Is superseded by CPCPGS4022A - Service Type A gas appliancesChanges to performance criteria, required skills and knowledge, range statement and critical aspects Not equivalent to CPCPGS4012A 06/Feb/2013

ReleaseRelease date
1 1 (this release) 19/May/2011


SchemeCodeClassification value
ASCED Module/Unit of Competency Field of Education Identifier 040327 Plumbing  

Classification history

SchemeCodeClassification valueStart dateEnd date
ASCED Module/Unit of Competency Field of Education Identifier 040327 Plumbing  04/Nov/2011 
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Modification History

Not Applicable

Unit Descriptor

Unit descriptor 

This unit of competency specifies the outcomes required to diagnose and repair faults on domestic and commercial Type A gas appliances.

Work associated with this unit is undertaken within the scope of AS5601 (AG601) Gas installations and local licensing requirements (gas, electrical and plumbing).

Application of the Unit

Application of the unit 

Site location for work application may be a customer's premises.

Licensing/Regulatory Information

Refer to Unit Descriptor


Prerequisite units 


Employability Skills Information

Employability skills 

This unit contains employability skills.

Elements and Performance Criteria Pre-Content

Elements describe the essential outcomes of a unit of competency.

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold italicised text is used, further information is detailed in the required skills and knowledge section and the range statement. Assessment of performance is to be consistent with the evidence guide.

Elements and Performance Criteria



1. Prepare for work.

1.1. Appliance specifications and servicing and manufacturer manuals are obtained for planned work activity.

1.2. Safety  (OHS ) requirements associated with servicing Type A gas appliances , and workplace environmental requirements , are adhered to throughout the work.

1.3. Quality assurance  requirements for company operations are identified and adhered to.

1.4. Tools , equipment  and materials  are selected consistent with servicing needs, checked for serviceability, and faults are rectified or referred for action.

1.5. Tasks are planned in conjunction with others involved in or affected by the work.

1.6. Work area is prepared to support efficient conduct of servicing the Type A gas appliance.

1.7. Electrical safety checks and isolation procedures are completed and recorded to manufacturers' and other statutory and regulatory authority  requirements before servicing work is commenced.

2. Disassemble and assemble Type A gas appliances.

2.1. Appliance specifications and servicing and manufacturer manuals are obtained and analysed to confirm assembly and disassembly techniques and sequences.

2.2. Preliminary diagnosis is completed to focus and minimise disassembly requirement.

2.3. Disassembly and reassembly are carried out safely and in a sequential manner.

2.4. Appliance is assessed to ensure it complies with relevant standards and manufacturer specifications prior to commissioning and return to service.

3. Diagnose and remedy electrical and electronic circuitry faults.

3.1. Electrical safety checks and isolation procedures are completed and recorded to manufacturer and other authority requirements before servicing work is commenced.

3.2. Electrical circuit and wiring diagrams are read and correctly interpreted to identify potential fault pathways and locations.

3.3. Appropriate testing techniques , procedures and equipment are selected and applied to diagnose faults in circuit wiring, components and ignition systems.

3.4. Cause of fault is determined and confirmed.

3.5. Most appropriate corrective action is selected after a complete analysis of options.

3.6. Repair, replacement and adjustment  action is taken in accordance with manufacturer specifications or service manuals.

3.7. Appliance is assessed to ensure it complies with relevant standards and manufacturer specifications prior to commissioning and return to service.

4. Diagnose and remedy gas system faults on Type A gas appliances.

4.1. Electrical and gas safety checks and isolation procedures are completed and recorded to manufacturers' and other authority requirements before servicing work is commenced.

4.2. Gas system plans and diagrams are read and correctly interpreted to identify potential fault pathways and locations.

4.3. Appropriate testing techniques, procedures and equipment are selected and applied to diagnose gas system faults.

4.4. Flue gases are analysed in accordance with recognised industry practice and local authority requirements.

4.5. Cause of fault is determined and confirmed.

4.6. Most appropriate corrective action  is selected after a complete analysis of options.

4.7. Repair, replacement and adjustment action is taken in accordance with manufacturer specifications or service manuals.

4.8. Appliance is assessed to ensure it complies with relevant standards and manufacturer specifications prior to commissioning and return to service.

5. Clean up work area.

5.1. Work area is cleared and materials disposed of or recycled in accordance with state and territory legislation and workplace procedures.

5.2. Tools and equipment are cleaned, checked, serviced and stored in accordance with manufacturer recommendations and workplace procedures.

5.3. Information  is accessed and documentation completed in accordance with workplace requirements.

Required Skills and Knowledge


This section describes the skills and knowledge required for this unit.

Required skills 

Required skills for this unit are:

  • communication skills to:
  • access information
  • complete workplace documentation
  • enable clear and direct communication, using questioning to identify and confirm requirements, share information, listen and understand
  • follow instructions
  • identify requirements, including system requirements
  • organise and sequence tasks with others
  • read and interpret:
  • documentation from a variety of sources
  • regulations, standards, plans, specifications and drawings
  • record plans in writing
  • use language and concepts appropriate to cultural differences
  • use and interpret non-verbal communication, such as hand signals
  • identifying and accurately reporting to appropriate personnel any faults in tools, equipment or materials
  • numeracy skills to apply measurements and calculations
  • organisational skills, including the ability to plan and set out work
  • preparation for the work, fault diagnosis, disassembly, repair and replacement, reassembly and completion of work finalisation processes
  • servicing equipment and completing job records
  • teamwork skills to work with others to action tasks and relate to people from a range of cultural and ethnic backgrounds and with varying physical and mental abilities
  • technological skills to:
  • access and understand site-specific instructions in a variety of media
  • use mobile communication technology.

Required knowledge 

Required knowledge for this unit is:

  • accessing information and the processes for calculating material requirements
  • AS5601 (AG601) Gas installations, including the use of tables
  • basic electrical theory, including:
  • characteristics of electromotive force (EMF)
  • characteristics of fuses, circuit breakers, residual current devices and earthing systems
  • conduction
  • current flow
  • ignition systems
  • insulation
  • Ohm's law
  • burners and burner adjustment
  • characteristics of conversion from one gas type to another
  • classification of appliances and identification of related components
  • electrical safety, including isolation procedures and requisite precautions
  • gas appliance regulators
  • gas appliance thermostats
  • gas safety, including:
  • combustion characteristics and effects
  • isolation procedures
  • job safety analysis (JSA) and safe work method statements (SWMS)
  • operation of flame failure systems used in Type A gas appliances
  • SI system of measurement
  • types and properties of fuel gas, including pressure and flow rates
  • workplace and equipment safety requirements.

Evidence Guide


The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Overview of assessment 

This unit of competency could be assessed in the workplace or a close simulation of the workplace environment providing that simulated or project-based assessment techniques fully replicate plumbing and services workplace conditions, materials, activities, responsibilities and procedures.

Critical aspects for assessment and evidence required to demonstrate competency in this unit 

A person who demonstrates competency in this unit must be able to provide evidence of:

  • locating, interpreting and applying relevant information, standards and specifications to determine requirements and maintain Type A gas appliances
  • applying safety requirements throughout the work sequence, including the use of equipotential bonding procedures, and personal protective clothing and equipment; and isolation of appliances from gas and electrical services
  • as a minimum, the ability to perform the following servicing activities and functions:
  • disassembly, reassembly, testing and recommissioning of a minimum of two different Type A gas appliances
  • conduct evaluative tests on electrical and electronic components, including central processing units, printed circuit boards and associated parts, in order to diagnose and remedy faults and malfunctions
  • conduct evaluative tests on gas systems to diagnose and remedy faults and malfunctions on the components listed in the range statement
  • convert a Type A gas appliance to operate on another gas type, in accordance with AS5601, any local utility's requirements and manufacturer specifications
  • servicing activities and function should ensure:
  • correct selection and use of appropriate processes, tools and equipment
  • completion of all work to specification
  • compliance with regulations, standards and organisational quality procedures and processes
  • communicating and working effectively and safely with others.

Context of and specific resources for assessment 

This competency is to be assessed using standard and authorised work practices, safety requirements and environmental constraints.

Assessment of essential underpinning knowledge will usually be conducted in an off-site context.

Assessment is to comply with relevant regulatory or Australian standards' requirements.

Resource implications for assessment include:

  • an induction procedure and requirement
  • realistic tasks or simulated tasks covering the minimum task requirements
  • relevant specifications and work instructions
  • tools and equipment appropriate to applying safe work practices
  • support materials appropriate to activity
  • workplace instructions relating to safe working practices and addressing hazards and emergencies
  • material safety data sheets
  • research resources, including industry related systems information.

Reasonable adjustments for people with disabilities must be made to assessment processes where required. This could include access to modified equipment and other physical resources, and the provision of appropriate assessment support.

Method of assessment 

Assessment methods must:

  • satisfy the endorsed Assessment Guidelines of the Construction, Plumbing and Services Training Package
  • include direct observation of tasks in real or simulated work conditions, with questioning to confirm the ability to consistently identify and correctly interpret the essential underpinning knowledge required for practical application
  • reinforce the integration of employability skills with workplace tasks and job roles
  • confirm that competency is verified and able to be transferred to other circumstances and environments.

Validity and sufficiency of evidence requires that:

  • competency will need to be demonstrated over a period of time reflecting the scope of the role and the practical requirements of the workplace
  • where the assessment is part of a structured learning experience the evidence collected must relate to a number of performances assessed at different points in time and separated by further learning and practice, with a decision on competency only taken at the point when the assessor has complete confidence in the person's demonstrated ability and applied knowledge
  • all assessment that is part of a structured learning experience must include a combination of direct, indirect and supplementary evidence.

Assessment processes and techniques should as far as is practical take into account the language, literacy and numeracy capacity of the candidate in relation to the competency being assessed.

Supplementary evidence of competency may be obtained from relevant authenticated documentation from third parties, such as existing supervisors, team leaders or specialist training staff.

Range Statement


The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Safety  (OHS ) is to be in accordance with commonwealth, state and territory legislation and regulations and may include:

  • handling of materials
  • hazard control
  • identification and testing for electrical hazards
  • personal protective clothing and equipment prescribed under legislation, regulations and workplace policies and practices
  • safe operating procedures, including recognising and preventing hazards associated with:
  • electrical components and safety
  • gas fires and explosions
  • hazardous materials and substances
  • service lines
  • surrounding structures and facilities
  • trip hazards
  • use of tools and equipment
  • work site visitors and the public
  • working at heights
  • working in proximity to others
  • use of firefighting equipment
  • use of first aid equipment
  • workplace environment and safety.

Type A gas appliances :

  • are badged appliances of less than 500 megajoules (MJ) for which an Australian Gas Authority (AGA) and Australian Liquefied Petroleum Gas Association (ALPGA) approval scheme exists
  • include:
  • decorative heaters
  • ducted heating systems
  • gas stoves and hot plates
  • heated water storage
  • instant heated water heaters
  • space heaters
  • mechanical components and gas appliance systems, including:
  • combustion chambers
  • heat exchangers
  • primary flues.

Environmental requirements  may include:

  • air pollution
  • clean-up protection
  • waste management.

Quality assurance  requirements may include:

  • AGA requirements
  • Environment Protection Authority (EPA)
  • internal company quality assurance policy and risk management strategy
  • International Standards Organisation
  • maintenance of Type A gas appliances complying with appropriate Australian standards
  • site safety plan
  • workplace operations and procedures.

Tools and equipment  may include:

  • lifting and load shifting equipment, including:
  • chain blocks
  • forklifts
  • hand trolleys
  • hoists and jacks
  • rollers
  • measuring equipment
  • test equipment and instruments, including:
  • dual probe voltage tester
  • manometers
  • multi-meters
  • megohmmeter
  • hand and power tools
  • spanners
  • wrenches.

Materials  for the maintenance of Type A gas appliances:

  • may include:
  • piping materials
  • regulators and meters
  • Type A gas appliances
  • other approved materials
  • are to comply with appropriate standards for the maintenance of Type A gas appliances.

Statutory and regulatory authorities  include:

  • statutory electrical authority
  • statutory gasfitting authority
  • statutory plumbing authority
  • other relevant state or territory and local statutory authorities.

Testing techniques :

  • de-energised and energised tests mayinclude:
  • capacitors
  • electric motors
  • heat activated switches
  • ignition systems (basic, ignition and re-ignition, flame safeguard systems, hot surface ignition)
  • printed circuit boards
  • relay time delay and conventional
  • solenoid coils
  • thermistors
  • thermostats, direct and indirect wired
  • time clocks, mechanical and electronic
  • transformers.

Adjustment  and calibration are to include:

  • dip switches
  • fan limit controls
  • fan speed settings
  • heat anticipators
  • thermostats.

Corrective action  such as component removal and replacement is to include:

  • burners
  • combination controls
  • fans
  • pilots
  • rail cocks, thermostats and associated components
  • solenoid valve regulators
  • thermocouples.

Information  may include:

  • charts and hand drawings
  • diagrams or sketches and graphics
  • instructions issued by authorised organisational or external personnel
  • job drawings
  • manufacturer specifications and instructions
  • maps
  • material safety data sheets (MSDS)
  • memos
  • organisation work specifications and requirements
  • regulatory and legislative requirements, particularly those pertaining to:
  • building codes
  • OHS and environmental requirements
  • plumbing and gasfitting authority regulations
  • relevant Australian standards, including AS/NZS3000 Electrical installations, AS/NZS4836 Safe working on low-voltage electrical installations, AS5601 (AG601) Gas installations
  • safe work procedures relating maintaining Type A gas appliances
  • signage
  • verbal, written and graphical instructions
  • work bulletins
  • work schedules, plans and specifications.

Unit Sector(s)

Unit sector 

Plumbing and services

Co-requisite units

Co-requisite units 


Functional area

Functional area