WorksheetsMTL2 Central Heating Learner Outcome 7
Total questions: 16
Worksheet time: 8mins
Why are manufacturer’s instructions essential during servicing?
They reduce servicing time
They replace Building Regulations
They specify correct servicing intervals and procedures
They are optional guidance
What information is commonly found in a maintenance schedule?
Pipe sizing data
Radiator heat outputs
Recommended service intervals
Flue terminal positions
Failure to follow manufacturer’s instructions may result in:
Improved efficiency
Reduced corrosion
Invalidated warranty
Lower system pressure
What may indicate poor circulation in a heating system?
Even radiator temperatures
Silent operation
Radiators cold at the bottom
Stable system pressure
What does black sludge in system water usually indicate?
Limescale
Plastic degradation
Electrolytic corrosion
Excess inhibitor
What should be checked first if a radiator is not heating up?
Boiler flue
Expansion vessel
Radiator valves
Condensate pipe
Why should TRVs be checked during maintenance?
To improve aesthetics
To reduce pipe size
They may stick or fail to operate
To increase pressure
What action may temporarily improve circulation during checks?
Closing valves
Reducing temperature
Increasing pump speed
Draining the system
What must be done before repairing a leaking heating pipe?
Increase system pressure
Remove inhibitor
Isolate and drain the system
Bleed radiators
Who should replace electrical control components?
Apprentice plumber
Customer
Qualified and competent operative
Any tradesperson
A leaking radiator air vent should be:
Overtightened
Sealed with silicone
Replaced
Painted
What safety step must be taken before draining a system?
Open windows
Remove radiators
Isolate the electrical supply
Increase flow temperature
Why should old radiators be handled carefully during replacement?
They are heavy
They are pressurised
They may contain dirty sludge water
They are fragile
What detail should always be recorded after maintenance?
Pipe diameter
Radiator colour
Date and nature of work carried out
Installer preference
Why is recording boiler make and model important?
For aesthetics
For insulation selection
For future servicing and fault diagnosis
For zoning
What should be recorded if corrosion is found?
Radiator size only
Boiler pressure
Location and extent of corrosion
Timeclock settings
