Burnt heater is #1 fault in Egypt — 65% caused by hard water scale. Salts crystallize at 60-90°C forming insulating layer. Heat cannot transfer, heater runs full power without cooling, eventually burns.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing Heater burnt from hard water scale — ranked from most to least common.
Hard water — calcium carbonate > 200 ppm
Hot programs without polyphosphate filter
Neglecting vinegar cleaning every 3-6 months
Cheap high-pH detergents
Bathroom installation
Voltage fluctuations
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.