Installation Guide

TROUBLESHOOTING
LED STATUS PROBLEM CORRECTIVE ACTION
0 FLASHES (LED NOT LIT) Pilot light is not lit. Not enough
power (millivolts) to keep it lit.
Follow the lighting instructions on the front of the water
heater and record any diagnostic codes. See “Status
Light Codes” section.
1 FLASH (EVERY 3 SECONDS) Normal operation. No corrective action necessary.
2 FLASHES Insufficient power (millivolts) to the
gas control valve/thermostat.
1. Check all wiring connections. If problem persists
proceed to step 2.
2. Replace the thermopile. See “Replacing the Pilot/
Thermopile Assembly.”
4 FLASHES High water temperature has
activated the over heat sensor.
Replace the gas control valve/thermostat. See “Removing
and Replacing the Gas Control Valve/Thermostat.”
5 FLASHES Water temperature sensor failure Replace the gas control valve/thermostat. See “Removing
and Replacing the Gas Control Valve/Thermostat.”
6 FLASHES Accessory Module Alarm Replace the burner assembly.
7 FLASHES Gas Control Valve/Thermostat
failure.
Replace the gas control valve/thermostat. See
“Removing and Replacing the Gas Control Valve/
Thermostat.”
8 FLASHES This condition only appears if the
gas control/temperature knob has
been turned off and the thermopile
continued to produce electric
power. This condition can occur if
the thermopile does not cool down
as quickly as expected when the
unit is shut off. This condition
can also occur if the gas control/
temperature knob has been
turned off and the pilot continues
to operate because the pilot valve
is stuck in the open position.
Make sure that the gas control valve/thermostat knob
is set to OFF. Wait one minute. Remove the outer door.
Look through the sight glass for a pilot flame. If a pilot
flame is observed with the gas control valve/thermostat
knob set to the OFF position, the pilot valve is stuck
open. Turn the main gas supply OFF. Replace the gas
control valve/thermostat. For instructions, see “Removing
and Replacing the Gas Control Valve/Thermostat.”
If the pilot flame is not observed when the gas control
valve/thermostat knob is set to the OFF position, wait 10
minutes for the thermopile to cool, then attempt to relight
the pilot by following the lighting instructions on the water
heater’s label. If this condition returns, replace the gas
control valve/thermostat. See “Removing and Replacing
the Gas Control Valve/Thermostat” for instructions.
9 FLASHES Combustion chamber temperature
sensor circuit is open or shorted
1. Check all connections. If the problem persists,
proceed to step 2.
2. Replace the temperature sensor. (Temperature
sensor replacement must be performed by a qualified
person.) If the problem persists, proceed to step 3.
3. Replace the gas control valve/thermostat. For
instructions, see “Removing and Replacing the Gas
Control Valve/Thermostat.”
10 FLASHES LDO occurrence was detected
in the combustion chamber
(contaminants)
1. Reset the system by following these steps: 1.) Turn
the temperature adjustment knob to OFF. 2.) Unplug
the thermopile plug from the gas control valve/
thermostat. 3.) Wait for about three minutes. 4.) Plug
the thermopile plug back into the gas control valve/
thermostat. 5.) Turn the temperature adjustment knob
to PILOT and restart the water heater as directed in
this manual. If the problem persists, proceed to step
2.
2. Follow the procedure outlined in “Cleaning the
Combustion Chamber and Flame-Trap.”
If the problem persists, proceed to step 3.
3. Shut off the gas supply to the water heater and
contact Customer Service at 1-877-817-6750.
Residen al Ultra Low NOx Gas Water Heater Use and Care Guide • 27
TROUBLESHOOTING