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35
Gas Control LED Error Codes
LED Status Problem Solution
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VAC ▲ A B C
An open earth ground circuit to the
ignition system.
1. Check that the earth ground connection is properly con-
nected.
2. Check that the ground conductor on the water heater is
properly connected.
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VAC ▲ A B C
Wiring error or a high resistance to
earth ground.
1. Check proper connection of line neutral and hot wires.
2. Check that the water heater is securely connected to earth
ground.
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VAC ▲ A B C
Pressure switch remained closed
longer than 5 seconds after the call for
heat began.
1. Pressure switch wiring is incorrect.
2. Replace pressure switch.
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VAC ▲ A B C
Pressure or temperature switch
remained open longer than 5 seconds
after the combustion blower was
energized.
1. Pressure or temperature switch(es) wiring is incorrect.
2. Pressure switches tubing is not connected correctly.
3. Air inlet, exhaust or condensate lines obstructed.
4. Check vent and air inlet pipe size used is per this installa-
tion instructions.
5. Check maximum number of elbows or maximum equiva-
lent feet of vent and air inlet pipe does not exceed recom-
mended length in these installation instructions.
6. Replace faulty switch(es) on blower assembly.
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VAC ▲ A B C
Error in the hot surface ignitor circuit. 1. Check that all wiring is correct and secure.
2. Replace hot surface ignitor.
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VAC ▲ A B C
System in lockout. 1. Gas supply is off or too low to operate.
2. Hot surface ignitor not positioned correctly.
3. Low voltage to the water heater.
4. Electric polarity to unit is incorrect - test and correct.
5. Replace gas control (thermostat).
6. Check that the ame sensor rod is making good contact
with burner ame.
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VA C ○ ▲ A B C
Problem in the gas valve driver circuit. 1. Turn power to the water heater off for 10 seconds and
then back on.
2. If error code persists, replace gas control (thermostat).
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VAC ▲ A B C
Problem with the internal circuit. 1. Turn power to the water heater off for 10 seconds and
then back on.
2. If error code persists, replace gas control (thermostat).
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VAC ▲ A B C
Flame signal sensed out of proper
sequence.
1. Turn power to the water heater off for 10 seconds and
then back on.
2. If error code persists, replace gas control (thermostat).
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VAC ▲ A B C
ECO activated. 1. Turn power to the water heater off for 10 seconds and
then back on.
2. If error code persists, replace gas control (thermostat).
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VAC ▲ A B C
One of the temperature adjust buttons
stuck closed.
1. Press and release each of the buttons once. Cycle water
heater power off and on.
2. If error code persists, replace gas control (thermostat).
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VAC ▲ A B C
Water temperature sensor error, open
or shorted.
1. Check that all wiring is correct and secure.
2. Turn power off.
2. Turn power to the water heater off for 10 seconds and
then back on.
3. If error code persists, replace gas control (thermostat).
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VA C ○ ▲ A B C
Flammable sensor problem. 1. Check for correct wiring to FV sensor.
2. Check for open circuits to FV sensor.
3. Replace FV sensor.
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VAC ▲ A B C
Flammable vapors near water heater.
Control in lockout.
1. FV sensor detected presence of ammable vapors.
2. Contact a service agency.
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VAC ▲ A B C
Weak flame current. 1. Check that the ame sensor rod is making good contact
with burner ame.
2. Contact a service agency.
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