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35
Gas Control (Thermostat) Status 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, remote control, burners, vent system or other
safety devices. Refer repairs to qualified service personnel.
LED Status Problem Solution
○ ○ ▼ 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
longer than 5 seconds after the call
for heat began.
1. Pressure switch wiring is incorrect.
2. Replace pressure switch.
○ ○ ▼ A B C
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Pressure switch remained open lon-
ger than 5 seconds after the combus-
tion blower was energized.
1. Pressure switch wiring is incorrect.
2. Pressure switch tubing is not connected correctly.
3. Air intake or exhaust obstructed.
○ ○ ▼ A B C
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Error in the hot surface ignitor cir-
cuit.
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 o 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 cor-
rect.
5. Combustion shut-o device tripped, contact ser-
vice agency.
○ ○ ▼ A B C
● ○ ○ ○ ● ●
Problem in the gas control
(thermostat) driver circuit.
1. Turn power to the water heater o for 10 seconds
and then back on.
2. Replace gas control valve.
○ ○ ▼ A B C
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Problem with the internal circuit.
1. Turn power to the water heater o for 10 seconds
and then back on.
2. Replace gas control valve.
○ ○ ▼ A B C
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Problem with the internal circuit.
1. Turn power to the water heater o for 10 seconds
and then back on.
2. Replace gas control valve.
○ ○ ▼ A B C
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Flame signal sensed out of proper
sequence.
1. Replace gas control valve.
○ ○ ▼ A B C
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ECO activated.
1. Replace gas control valve.
○ ○ ▼ A B C
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One of the temperature adjust but-
tons stuck closed.
1. Press and release each of the buttons once.
2. Replace gas control valve.
○ ○ ▼ A B C
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Water temperature sensor is either open
or short circuited.
1. Check that all wiring is correct and secure.
2. Replace gas control valve.
○ ○ ▼ 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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