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Gas Valve LED Codes
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation. VERIFY PROPER OPERATION AFTER SERVICING.
CAUTION: For your safety DO NOT attempt repair of gas piping, combination gas control thermostat, burners, vent
and/or combustion air-inlet systems or other safety devices. Refer repairs to qualified service personnel.
LED Status Problem Solution
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▼ A B C
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An open earth ground circuit to the
ignition system.
1. Check that the earth ground connection is properly
connected.
2. Check that the ground conductor on the water heater
is properly connected.
○ ○ ▼ A B C
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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.
○ ○ ▼ A B C
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Pressure switch remained closed lon-
ger than 5 seconds after the call for
heat began.
1. Verify that the wiring to the pressure switch(es) is
correct.
2. Replace the pressure switch(es).
○ ○ ▼ A B C
● ○ ● ○ ○ ●
Pressure switch remained opened lon-
ger than 5 seconds after the combus-
tion blower was energized.
1. Verify that the wiring to the pressure switch(es) is
correct.
2. Verify that the wiring to the pressure switch(es) is
connected correctly.
3. Check the vent and / or combustion air-inlet systems
for obstructions.
○ ○ ▼ A B C
● ○ ● ○ ● ●
Error in the hot surface ignitor circuit. 1. Check that all wiring is correct and secure.
2. Replace hot surface ignitor.
○ ○ ▼ A B C
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System in lockout.
1. Gas supply is off or too low to operate. Turn on the
gas supply and / or increase the inlet gas supply pres-
sure.
2. Hot surface ignitor not positioned correctly.
3. Low voltage to the water heater. Increase supply volt-
age to rated voltage.
4. Electric polarity to unit is incorrect - test and correct.
5. Check the vent and /or combustion air-inlet systems
for obstructions.
○ ○ ▼ A B C
● ○ ○ ○ ● ●
Problem in the combination gas valve
driver circuit.
1. Turn power to the water heater off for 10 seconds and
then back on.
2. Replace the combination gas control (thermostat).
○ ○ ▼ A B C
● ○ ● ● ● ○
Problem with the internal circuit. 1. Turn power to the water heater off for 10 seconds and
then back on.
2. Replace the combination gas control (thermostat).
○ ○ ▼ A B C
● ● ● ● ● ●
Problem with the internal circuit. 1. Turn power to the water heater off for 10 seconds and
then back on.
2. Replace the combination gas control (thermostat).
○ ○ ▼ A B C
● ○ ○ ○ ● ○
Flame signal sensed out of
proper sequence.
1. Replace the combination gas control. (thermostat)
○ ○ ▼ A B C
● ○ ○ ● ● ●
ECO activated. 1. Replace the combination gas control (thermostat).
○ ○ ▼ A B C
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One of the temperature adjust
buttons stuck closed.
1. Press and release each of the buttons once.
2. Replace the combination gas control (thermostat).
○ ○ ▼ A B C
● ○ ● ● ○ ●
Water temperature sensor is either
open or short circuited.
1. Check that all wiring is correct and secure.
2. Replace the combination gas control (thermostat).
○ ○ ▼ A B C
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Unit shuts down. 1. Check for correct wiring to FV sensor.
2. Check for open circuits to FV sensor.
3. Replace FV sensor.
○ ○ ▼ A B C
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Unit shuts down and in lockout.
1. FV sensor detected presence of ammable vapors.
2. Contact a service agency.
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