58 • Residen al Gas Tankless Water Heater Use and Care Guide
TROUBLESHOOTING
Error
Code
Error Type
Procedure
E037
False Flame Detec on
WARNING! Working on an energized circuit can result in severe injury or death from
electrical shock.
1. Check for a visible
fl
ame through the sight glass while water is not running
through the water heater. If the error s ll occurs, immediately shut-o
ff
the water
heater and contact a quali
fi
ed service technician.
2. Check
the
fl
ame sensor wire for a short or disconnec on. Correct any loose con-
nec on and replace any damaged wire/connector. If the error s ll occurs, contact
a quali
fi
ed service technician.
E038
Igni on Failure
WARNING! Working on an energized circuit can result in severe injury or death from
electrical shock.
1. Check for a visible
fl
ame through the sight glass.
2. Check
the
fl
ame sensor wire and igniter wire for a short or disconnec on. Cor-
rect any loose connec ons and replace any damaged wire/connector. If the error
s ll occurs, contact a quali
fi
ed service technician.
E041
Outlet Water Over-temp.
1. Verify the thermistor reading with the water outlet temperature.
2. Remove the thermistor (do not lose the o-ring) and check for any dirt or debris.
Clean with an Emery cloth. If the thermistor is damaged, replace it. If the error
s ll occurs, contact a quali
fi
ed service technician.
E045
Clock Ba ery Replacement
1. The clock ba ery voltage is low indica ng it should be replaced with a 2032 type
ba ery. This error may also appear when supply power has been turned back on.
In this case, ignore the error code. Reference “Printed Circuit Board Ba ery” on
page 40.
E049
Exhaust Thermistor Failure
1. Remove the thermistor (do not lose the o-ring) and check for any dirt or debris.
Clean with an Emery cloth. If the thermistor is damaged, replace it.
2. 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.
E050
Inlet Thermistor Failure
1. Remove the thermistor (do not lose the o-ring) and check for any dirt or debris.
Clean with an Emery cloth. If the thermistor is damaged, replace it.
2. 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.
E051
Outlet Thermistor Failure
1. 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.
2. 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.
E052
Heat Exchanger Thermistor
Failure
1. 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.
2. 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.
