Worksheets9189PH3HWPPT4
Total questions: 23
Worksheet time: 12mins
What should the repair of system components be undertaken using according to the Level 3 Diploma in Plumbing and Domestic Heating?
The latest technology in plumbing
Manufacturer's servicing and maintenance instructions
General plumbing guidelines
Personal experience and judgment
What will the manufacturer's instructions contain for the repair of components or appliances?
The price of the components
The warranty information
The order in which the components or appliances should be dismantled and re-assembled
The history of the company
Which of the following will the manufacturer's instructions outline?
Installation procedures for new technology
Fault diagnosis procedures
Customer reviews
Energy-saving tips
What is included in the manufacturer's instructions besides fault diagnosis procedures?
Instructions for creating a budget
Spare parts list
Marketing strategies
Legal disclaimers
What is the recommended repair for a pump with a burnt out motor?
Recharge vessel
Replace pump
Replace capacitor, as per MIs
Check Schrader valve with leak detector
Which component is likely at fault if there is no pressure in the vessel, with water discharging from the relief valve?
Pump
Expansion vessel
Schrader valve
Capacitor
If water is coming from the Schrader valve and from the relief valve, what is the likely known fault?
Pressure loss
Ruptured bladder or diaphragm
Impeller broken or worn
Cracked casing
What is a symptom of a cracked casing in a pump?
Motor running, little or no water at outlet
Pump not working, smell of burning
Water leak
Slow starting
What is the known fault for a pressure relief valve according to the document?
Valve not seated correctly
Water dripping when the system is hot
Cold water running constantly
Incorrect pressure in the system
What repair should be done if the pressure relief valve shows water running constantly?
Recharge vessel or replace
Clean seating/replace
Check/replace the pressure reducing valve
Isolate system; check/repair thermostat
If a temperature pressure relief valve has hot water running constantly, what might be the cause?
Incorrect pressure in the system
Valve not seated correctly
Incorrect system pressure or faulty pressure relief valve
Thermostat too high or safety malfunction
If a high limit thermostat is associated with no hot water, what might be the symptom?
Thermostat is operating correctly
Hot water too high
No symptom
Cylinder thermostat may have malfunctioned
What is the cause of poor flow rate in a plumbing system?
Heat source failure
High limit cut-out activated
Strainer blocked
Motorised valve failure
What repair should be carried out if the water from hot taps is cold due to a high limit cut-out being activated?
Check and open valve
Isolate water and clean out
Check that valves are open
Check cylinder thermostat for malfunction; replace, if necessary
If hot water is discharging into CWSC from vent, what could be the cause?
Limited head height
Pump failure
Heat source failure, thermostat failure or high limit failure
Thermostat set too low
What is the cause of a pump not starting in a plumbing and domestic heating system according to the Level 3 Diploma material?
Inlet/outlet reversed
Electrical
Insufficient flow
Leak in the system
What is a recommended repair action for a float switch sticking fault?
Check that the installation complies with the instructions, whether any filters are blocked and minimum flow rate in Mls
Check power, fuse MCB and for loose wires
Check pipework; ensure that all outlets are closed
Check the switch for debris; replace, if necessary
What is a possible cause for a noisy pump in a plumbing system?
Pump is subjected to mains pressure
Thermostatic mixer valve failure
Air in the system
Chemical damage
If the temperature at the outlet is too high, what might be the fault?
Pump vibrating against the surface
Air in the system
Pump is subjected to mains pressure
Thermostatic mixer valve failure
What is the first step in the process of fault rectification according to the diagram?
Notify customer
Diagnose
Handover
Isolate safely
What should be done after diagnosing the fault in the process of fault rectification?
Re-commission
Notify customer
Rectify
Handover
According to the diagram, what is the step that follows 'Isolate safely' in the fault rectification process?
Decommission
Notify customer
Rectify
Re-commission
What is the final step in the process of fault rectification as shown in the diagram?
Decommission
Notify customer
Handover
Diagnose
