Message d'origine par : Dan ,
Sadly it sounds like the compressor is going or the refrigerant has leaked out. These are little mini heat pumps moving the heat from the water in one tank to another one creating cold & hot water (excess heat is also dumped into the air). If the pump is not able to compress the refrigerant it is unable to remove the heat and could be doing the reverse here pushing heat in to the cold side. In any case it would be warm not hot water.