Yesterday our house slowly turned colder and colder. This morning before work I inspected the heater and was greeted with the error code A02.06. A peek at the manual revealed that the water pressure in the system was too low. I added quite a bit but the error remained. Without being able to see the actual pressure, how could I know when to stop adding water? Oddly enough, the error code is displayed where usually the pressure is displayed. The steps described in the manual to have the pressure displayed didn’t work. The solution is actually quite simple: just add water until the error code disappears...

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