Examining the internals of a tankless gas water heater, explaining how does it work and repairing it using a vacuum cleaner. It was showing an error code "F.28" in random intervals. After vacuum cleaning the air intake mesh, the gas / air mixer, the burner and the primary heat exchanger, this gas water heater works again :). It's also useful to keep the ignition electrodes and the flame sensor electrode (ionisation electrode) clean.
WARNING:
-Gas water heaters (water boilers) are very dangerous!
-Never try to repair or disassemble them!
-Risk of injury, electric shock, fire, burns, explosion, gas leakage, gas poisoning, water leakage and so on...
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