System Faults in Hot Water Systems Phase 3

Where can you find fault diagnosis procedures for system components?

• Manufacturer's instructions

• YouTube channel

• Technical helpline

• Website

What should be done if a system component cannot be repaired?

• Replace the component

• Contact the manufacturer

• Check the spare parts list

• Follow fault-finding chart

What is the known fault if the impeller of a pump is broken or worn?

• Motor running, little or no water at outlet

• Pump not working, smell of burning

• Water leak

• Slow starting

What is the known fault if the pressure relief valve is dripping water when the system is hot?

• Indication that expansion vessel has lost its charge

• Incorrect pressure in the system

• Valve not seated correctly

• Cold water running constantly

What is the known fault if the thermostat is not operating correctly and the hot water is too high?

• Hot water running constantly

• No hot water

• Thermostat is not operating correctly

• No hot water flow

What is the cause of poor flow rate in a hot water system?

• Strainer blocked

• Heat source failure

• Motorised valve failure

• Pump failure

What is the cause of water temperature being lukewarm in a hot water system?

• Pump failure

• Thermostat set too low

• Limited head height

• Heat source failure

What is the cause of a pump not starting in a hot water system?

• Electrical

• Inlet/outlet reversed

• Insufficient flow

• Float switch sticking

What is the cause of a pump leaking in a hot water system?

• Pump is subjected to mains pressure

• Chemical damage

• Temperature damage

• Thermostatic mixer valve failure

What is the process of fault rectification in a hot water system?

• Decommission

• Rectify

• Both water and electricity, if required

• None of the above