Siemanko. I have a similar problem with the KOSPEL PPH-2 heater, the boiler is a year old. At first, the water was warming up quite well, (the case also applies to 3 other heaters) after 6 months the problem started - either boiling water or cold water - the water temperature could not be adjusted. After a year, in 3 days he stopped heating the water - max temp is 25 degrees.
The system was cleaned, in the heater and I did not find any larger impurities or scale, after blowing the installation with a compressor appeared fine black dust much finer than sand grains. After putting everything together, as I unscrew the tap next to the sink and tub at once and turn off the pressure in the sink should jump suddenly and return to normal after about 2 seconds, this goes to observe. However, there is no pressure drop visible when any tap is turned on. I cleaned the strainers in the tap and the orifice assembly also there was no major pollution. Before the heater stopped working completely, I unscrewed two taps at once and boiling water began to fly, 3 cities each. this method has stopped working. I change the 2nd and 3rd heater after max year is the same with every heater. Is it possible that the membrane fell so quickly? I have a request for help, what's the matter with the WC-3 switch ??
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