Rinnai R53i-1

Paul S_3

hey everyone....i am having a problem with a rinnai tankless water heater model#r53i-1....they have intermittent problems with the hot water....for example it will lite then lockout 10 seconds later....then there will be times that it will stay firing while the water is being used for 20 straight minutes.....this rinnai water heater was installed by a unknown company...there is no digital display to view fault codes or adjust temp.....factory default for water temp is at 120f.....rinnai heater is vented vertically about 14 ft to roof(the condensate drain on the pvc vent has a plug in it , not drained)....i called the tech support line and the technician couldnt really help me because the digital display wasnt there....he asked me to checked the clear rubber hose connected to gasvalve which is connected i think to the combustion chamber and there was water in the tube????.....the technician told me it was a faulty gas valve(coil sticking??)....my question ishow would water get into that rubber hose ??? and does anyone think its a faulty gas valve???

                           Paul S