A.O. Smith XVRL-40 Technical Documents | Page 10

A.O. Smith Water Heater Technical Documents - XVRL-40.
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 10 • Residential Standard Gas Water Heater Service Handbook

PIL

O

T/FLASH C

ODE

S

7. Wait 10 minutes and try to light the 

Pilot according to the instructions 
on the water heater’s label.

8. 

While clicking the igniter button 
continuously, the control knob must 
be set to Pilot and held in until the 
Status Light blinks. Once the status 
light blinks, release the control knob 
and set the knob to the desired 
temperature setting.  (“Hot” is 
approximately 120°F.)

 DiagnosƟ c Flash Codes
NOTE:
 In each case, the flash code will 
occur, followed by a 3 second pause, 
and then will repeat.   

  0 Flashes (LED not lit) 

Indication/Condition:  
Control Off/Pilot Out.

Check/Repair:   

1.  Follow the lighting instructions on the 

front of the water heater and attempt 
to relight the pilot.  Confirm that 
the pilot is lit by looking through the 
viewport (Figure 16, p. 17).    

2. If pilot will light but does not 

hold, check for a tripped thermal 
switch.  (Measure continuity by 
placing a meter lead on each of 
the two terminals.  Continuity 
means that it was not tripped.)  If 
thermal switch is tripped, check for 
flammable vapors in the area and 
ensure that the unit has adequate 
combustion air and proper draft 
before relighting.  (You can reset 
the thermal switch by pressing the 
reset button in its center.)  Also, 
ensure that the filter and flame 
arrestor are clean (p. 18).  

3.  If the pilot will light and does hold, 

record any status codes and follow 
the procedures relating to that code.

4.  If pilot will not light at all, verify the 

piezo igniter is producing a spark 
and the unit is getting the correct 
supply gas pressure.    See “Testing 

the Igniter System” (p. 19); 
“Gas Pressure Checks” (p. 11). 

 

Also, check the thermopile wiring 
connections (Figure 16, p. 17).  

 Status Light On (solid) 

Indication/Condition:  
Pilot light was recently extinguished 
and the thermopile is cooling down.

Check/Repair: 

1. Turn the gas control valve/

thermostat knob to OFF. 

2.  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.  NOTE: This gas control valve/
thermostat has built-in circuitry 
that requires waiting 10 minutes 
between lighting attempts. 

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 Flash 

Indication/Condition:  
Normal Operation (bright/dim 
heartbeat)

Check/Repair:  No corrective action 
necessary.

  2 Flashes 

Indication/Condition:  
Thermopile voltage low.

Check/Repair:

1.  Check all wiring connections for loose 

or damaged wires.  Correct if needed.

2.  Check the millivolt output on the 

thermopile. If output is less than 350 
millivolts DC, replace the thermopile.

See also “Condensation” on page 15.

4 Flashes 

Indication/Condition:  
Temperature exceeded (ECO activated).

Check/Repair:

1.  Turn gas control valve/thermostat 

knob to OFF. 

2.  Turn the main gas supply OFF.  

3. Replace the gas control valve/

thermostat.

 5 Flashes 

Indication/Condition: Sensor failure.

Check/Repair:

1.  Turn gas control valve/thermostat 

knob to OFF. 

2.  Turn the main gas supply OFF.  

3. Replace the gas control valve/

thermostat.

 7 Flashes 

Indication/Condition:  
Internal control failure.  

Check/Repair:

1.  Turn gas control valve/thermostat 

knob to OFF. 

2.  Turn the main gas supply OFF.  

3. Replace the gas control valve/

thermostat.

  8 Flashes 

Indication/Condition: Power off failure. 

Check/Repair:

1.  If the pilot flame is present when 

the control knob is set to the OFF 
position, replace the gas control 
valve/thermostat.

2.  If the pilot flame is not present when 

the control knob is set to the OFF 
position, wait 10 minutes for the 
thermopile to cool, then relight the 
unit. If this condition returns, replace 
the gas control valve/thermostat.

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