01 — Common problems
What can go wrong with your water heater.
What's usually behind each symptom and what you can check yourself while the technician is on the way. Without touching anything inside.
The most common cause is a burnt-out heating element or a thermostat that no longer cuts out properly. It could also be that the water heater is now too small for your household.
In the meantime · Check whether the water heater's indicator light comes on. If it never comes on, tell the technician.
Limescale builds up on the heating element and at the bottom of the tank, so the water heater needs more time and more electricity to heat the same amount.
In the meantime · Note how many litres it holds (it's on the label) and how many people live in your home.
If it drips from the safety valve while it's heating, that can be normal; if the water is coming from the tank itself, it usually means it's corroded inside.
In the meantime · Put a bucket underneath and, if the dripping doesn't stop, close the water heater's stopcock.
It's usually a heating element with an earth leakage or damp in the connections. It's best not to keep resetting the trip switch (RCD) again and again.
In the meantime · Leave the water heater switched off at its own switch, or unplugged, until the technician has seen it.
Clicking and bubbling sounds are usually limescale at the bottom of the tank. It isn't dangerous, but it means the water heater is working harder than it should.
In the meantime · Notice whether the noise gets worse over the days; it helps decide whether it's worth repairing.
When a water heater starts failing often, it's usually worth replacing it with one of the right capacity for your home.
In the meantime · Take a photo of the water heater's label and of the space where it hangs.