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Rinnai ruc98, intermittent hot water
Hello all. I am new to the forum, stumbled upon it while searching for help. Thanks in advance to all that take time to help out on these forums. I just moved into a new home, new construction . The house is equipped with a rinnai ruc98 water system. Natural gas . It's a single family home . Last night the unit worked great when I had a shower, this am it would only provide about 20 seconds of hot water . The in use light would go out, it would begin to beep and the water temp where it usually says 120 would say 25 . The control panel Is very basic , on/off, priority, up down buttons , and a digital readout . I have a call in to the home builder but while waiting I thought I wouldn't post here also. Thanks everyone .