Status Light And Diagnostic Code Troubleshooting Chart - John Wood Water Heater Installation And Operating Instructions Manual

Status Light And Diagnostic Code Troubleshooting Chart

LED STATUS
0 FLASHES Pilot light is not lit or Thermopile has
(LED NOT LIT) not yet reached normal operating
temperature.
RED LIGHT ON Pilot light was recently extinguished and
(SOLID) the Thermopile is cooling down.
1 FLASH Normal operation.
(EVERY 3
SECONDS)
2 FLASHES Pilot is lit but the Thermopile is not
producing the required output voltage.
4 FLASHES The Gas Control Valve's temperature
sensor has detected that the water
temperature was too high. Once this
condition occurs, the Main Burner and
the Pilot Light will be shut off. Since
the Pilot light will be off, should this
condition occur, this Flash Code will only
be displayed immediately after the Pilot
has been relit. Turn Gas Control Valve/
Thermostat knob to OFF.
5 FLASHES The temperature sensor (thermistor) is
defective.
7 FLASHES Gas Control Valve failure.
PROBLEM
– 24 –
CORRECTIVE ACTION
1. Turn Gas Control Valve/Thermostat knob to OFF. Wait
10 minutes, then attempt to relight Pilot by following the
lighting instructions on the water heater's label. Until the
Thermopile reaches its normal operating temperature,
the Status Light will not blink, even if the Pilot is lit. It may
take up to 90 seconds of continuous Pilot operation before
the Thermopile reaches normal operating temperature and
the Status Light starts to blink.
2. If the Status Light does not blink after three lighting
attempts, check to make sure unit is getting gas. Remove
the outer door. Press reset button. Replace outer door.
Turn Gas Control Valve/Thermostat knob to OFF. Wait 10
minutes, then attempt to light Pilot by following the lighting
instructions on the water heater's label. Look through
the view port for the Pilot flame. If Pilot is not visible, the
spark igniter or gas supply to the Pilot should be checked.
3. If the Pilot is visible and the Status Light does not blink
after 90 seconds of continuous Pilot operation, the Pilot
flame may not be heating the Thermopile sufficiently
(weak Pilot) or the Thermopile may be defective.
1. Turn Gas Control Valve/Thermostat knob to OFF. Wait 10
minutes for the Thermopile to cool, then attempt to relight
Pilot by following the lighting instructions on the water
heater's label. Until the Thermopile reaches its normal
operating temperature, the Status Light will not blink,
even if the Pilot is lit. It may take up to 90 seconds of
continuous Pilot operation before the Thermopile reaches
normal operating temperature and the Status Light starts
to blink.
1. No corrective action necessary.
1. Turn Gas Control Valve/Thermostat knob to OFF. The
Thermopile is probably defective, but loose wiring
connections or a weak Pilot flame can also cause this
symptom.
1. Turn Gas Control Valve/Thermostat knob to OFF. Turn
Main Gas Supply OFF. Replace the Gas Control Valve/
Thermostat. See "Removing and Replacing the Gas
Control Valve/Thermostat."
1. Turn Gas Control Valve/Thermostat knob to OFF. Replace
the temperature sensor (thermistor).
1. Turn Gas Control Valve/Thermostat knob to OFF. Turn
Main Gas Supply OFF. Replace the Gas Control Valve/
Thermostat. See "Removing and Replacing the Gas
Control Valve/Thermostat."