Question

Write possible faults that may occur in a Room Cooler and an Electric Geyser. How can these faults be removed?

Hint:

To prevent geyser corrosion and extend the life of the inner tank, regularly check and replace the sacrificial magnesium anode rod (every 2--3 years). It attracts corrosive minerals in the water, sacrificing itself to protect the steel tank.

Answer 1

Step 1: Identifying Common Faults and Remedies in a Room Cooler:
A room cooler relies on a water pump, a fan/blower motor, and speed control switches. Typical faults include:

• Fault: The blower motor hums but does not rotate.
  • Cause: Jammed or worn-out motor bearings, or a faulty/burnt run capacitor.
  • Remedy: Turn off the power and try spinning the fan by hand. If it is stiff, lubricate or replace the bearings. If it spins freely, test and replace the run capacitor.
• Fault: The fan runs, but no cold air is delivered (water pump not lifting water).
  • Cause: Burnt water pump motor, clogged pump inlet/impeller, or broken water distributor lines.
  • Remedy: Clean the pump impeller of salt deposits and dirt. If the pump motor is burnt, replace the pump. Clear any blockages in the water distributor tubes.

Step 2: Identifying Common Faults and Remedies in an Electric Geyser:
An electric geyser relies on high-wattage heating elements and temperature control safety devices. Typical faults include:

• Fault: The geyser is switched ON, but the water does not heat up.
  • Cause: Burnt heating element, tripped high-limit safety thermostat, or loose electrical connections.
  • Remedy: Check the continuity of the heating element using a multimeter; replace it if it is open-circuited. Press the manual reset button on the safety thermostat, or replace the thermostat if it is faulty.
• Fault: Water is leaking continuously from the geyser tank or valves.
  • Cause: Corroded inner storage tank, worn-out rubber gaskets, or a leaking pressure-release valve.
  • Remedy: Tighten the heating element flange bolts or replace the rubber gaskets. If the inner tank is corroded and leaking, the geyser tank (or the entire unit) must be replaced.