Immersion Rod: 

• Elements end may touch the corner of the metal tube which is known as short circuit and earth fault. 
• Connections of supply cord may be broken at the terminals; breakage of wire in the plug top which causes discontinuity and known as open circuit. 
• Breakage of element wire in the metal tube or element may burnt which is known as open circuit. 
• Leakage in supply cord which causes short circuit or cord too old. 
• Metal tube may be burst when not dipped inside the water. 
• Terminal housing may be broken which may cause leakage fault. 
• Any screw may be missing which causes loose fitting or connections. 

Geyser: 

• Failing of Supply Mains. Fuses blown or the blades of the main switch do not make contact with main blades or supply is cut off in the main switch. 
• Open and Short Circuit in the Wiring Circuit. Breakage of wire ends from the terminals or breakage inside the wires and touching of wire ends together or bare wire may touch together somewhere. 
• Heating Element may be defective. Element may be burnt. It can be checked with series test lamp by disconnecting the main connections 
• Thermostat device may be defective. Setting may be not proper or there may be leakage. 

Mixer: 

• If the tip bowl leaks 
• If the blades are broken 
• If the switch knob is loose 
• If the motor burns 
• If the blade does not rotate properly (freely) 

Room Cooler: 

• Blower does not throw cool air 
• Pump may not be working properly 
• Motor fails to start 
• Room cooler gives shock