This guide is for general information only. If you suspect an electrical fault or unsafe installation, switch off power where safe and contact a registered electrician.
Your geyser is one of the biggest electricity consumers in your home — and one of the most common sources of electrical problems. Here's a guide to the most common geyser issues and what to do when they happen.
Problem 1: Geyser Trips the Earth Leakage (ELCB)
If your geyser keeps tripping the earth leakage breaker, this is a serious warning sign. Possible causes:
- Faulty thermostat: A failed thermostat can cause the element to overheat, triggering the earth leakage.
- Failed element: The heating element develops a crack or break, allowing water into the electrical components.
- Deteriorated wiring: Old or damaged wiring from the geyser to the DB board can cause current leakage.
- Pressure build-up: Excessive pressure can force water into the element housing.
Do not keep resetting the earth leakage. Switch off the geyser at the isolator switch and call a registered electrician.
Problem 2: No Hot Water
- Tripped thermostat: The thermal cut-out may have tripped due to overheating. This can sometimes be reset, but if it trips repeatedly, the thermostat or element needs replacement.
- Failed heating element: The element has burnt out and needs replacement — a job for a registered electrician or plumber, depending on the geyser type.
- Tripped circuit breaker: Check the DB board. If the geyser circuit breaker has tripped, find out why before resetting.
- Geyser set too low: If the temperature is set below 55°C, water may not feel hot enough. Note: it should be set to at least 55°C to prevent Legionella bacteria growth.
Problem 3: Geyser Leaking
- Pressure relief valve (PRV) dripping: Some dripping is normal as the geyser heats and expands. Constant dripping means the PRV is faulty or the geyser pressure is too high.
- Tank corrosion: Older geysers (10+ years) can develop internal rust and eventually leak. Replacement is usually more cost-effective than repair.
- Pipe connections: Leaks at the inlet/outlet pipes may simply need a plumber's attention.
- Burst geyser: If the tank has burst, switch off the cold water supply and the electrical isolator immediately and call for help.
Geyser Safety Tips
- Install a geyser blanket to improve energy efficiency
- Have your geyser serviced or inspected every 5 years
- Install a timer to reduce electricity consumption
- Ensure there is a drip tray under the geyser — no drip tray means no COC
- Set the thermostat between 55°C and 60°C for safety and efficiency
- Never try to repair a faulty element or thermostat yourself
Key takeaways
- A tripping earth leakage with the geyser is a serious electrical fault — don't ignore it
- Common causes are failed elements, thermostats, and old wiring
- A leaking PRV may be normal — constant leaking is not
- Geysers older than 10 years should be assessed for replacement
- Always use a registered electrician for geyser electrical work
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