American Water Heater 318935-003 Benutzerhandbuch

30

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 Diagnostic Status Light Code 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.”

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 Technical Assistance.  The 

telephone number is listed on the cover of this 

manual.