Residen al Gas Tankless Water Heater Use and Care Guide • 59
TROUBLESHOOTING
Error
Code
Error Type
Procedure
E383
Inlet Water Over-Temp.
1. Verify the inlet water temperature is not above the water heater’s set tempera-
ture.
2. Remove the thermistor (do not lose the o-ring) and check for any dirt or debris.
Clean with Emery cloth. If the thermistor is damaged, replace it.
3. Check the Thermistor sensor wire for a short or disconnec on. Correct any loose
connec ons and replace any damaged wire/connector. If the error s ll occurs.
Contact a quali
fi
ed service technician.
E384
False Flame Detec on
WARNING! Working on an energized circuit can result in severe injury or death from
electrical shock.
1. Look through the sight glass for a
fl
ame. If the
fl
ame is present, immediately
shut o
ff
the gas to the water heater. Contact a quali
fi
ed service technician before
a emp ng to use the water heater.
2. If
no
fl
ame is present and the
fl
ame LED on the display is lit, Check the
fl
ame
sensor wire for a short or disconnec on. Correct any loose connec ons and
replace any damaged wire/connector. If the error s ll occurs, contact a quali
fi
ed
service technician.
E385
Gas Valve - SV1
1. The PCB detects an incorrect voltage from the gas valve solenoid valve 1 (SV1).
Correct any loose connec ons and replace any damaged wire/connector. If the
error s ll occurs, contact a quali
fi
ed service technician to replace the gas valve.
E388
Bypass Valve
1. Correct any loose connec ons and replace any damaged wire/connector.
2. Follow the draining procedure on page 55 to properly drain the water heater.
Remove the bypass valve and inspect for any debris or damage. Replace if need-
ed.
E392
Fan - False Start
1. Check the fan motor wiring. Correct any loose connec ons and replace any
damaged wire/connector. If the error s ll occurs, contact a quali
fi
ed service
technician.
E393
Fan - Signal Loss
1. Check the fan motor wiring. Correct any loose connec ons and replace any
damaged wire/connector. If the error s ll occurs, contact a quali
fi
ed service
technician.
E394
Fan - Target Speed
1. Check the fan motor wiring. Correct any loose connec ons and replace any dam-
aged wire/connector.
2. With the water heater power disconnected, check the exhaust vent and air
intake piping for any blockages. Remove any blockages.
3. If the error s ll occurs, contact a quali
fi
ed service technician.
