Check the heating element
Start by checking the heating element that is responsible for warming up the water. If you have access, look for any visible signs of wear or corrosion. Turn on the geyser for a few minutes, then test the water temperature.
If it heats unevenly or too slowly, the heating element may need a replacement.Inspect for sediment build-up
Minerals and sediments settle at the bottom of the tank when the geyser has been inactive for a long time, affecting heating efficiency. To clean it, you need to carefully drain the geyser. This helps flush out any sediment, making your geyser work more efficiently.Water pressure check
High water pressure can strain your geyser.
Use a pressure gauge if you have one, or check that water doesn’t spurt aggressively when turned on. If it’s too high, consider installing a pressure valve, which can be bought at any hardware store. If you don’t have proper knowledge of how to install the pressure valve, consider calling a professional.Check the thermostat
The thermostat controls water temperature.
Turn on the geyser and monitor if it reaches the desired temperature without overheating. If the water is too hot or doesn’t warm up enough, adjust the thermostat dial slightly as mentioned in the user manual. If you don’t have the manual anymore, it is advisable to call a professional.Inspect pipes and valves
Look over the pipes and valves for any visible cracks or leaks.