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Gas Valve LED Codes
LED Status
○ ○
▼ A B C
● ○ ○ ● ○ ○
An open earth ground circuit to the
ignition system.
○ ○
▼ A B C
● ○ ● ○ ● ○
Wiring error or a high resistance to
earth ground.
○ ○
Pressure switch remained closed
▼ A B C
● ○ ● ○ ○ ○
longer
than 5 seconds after the call for
heat began.
○ ○
Pressure switch remained open lon-
▼ A B C
● ○ ● ○ ○ ●
ger
than 5 seconds after the combustion
blower was energized.
○ ○
Error in the hot surface ignitor cir-
▼ A B C
● ○ ● ○ ● ●
cuit.
○ ○
System in lockout.
▼ A B C
● ○ ○ ● ● ○
○ ○
▼ A B C
● ○ ○ ○ ● ●
Problem in the gas valve driver cir-
cuit.
○ ○
▼ A B C
● ○ ● ● ● ○
Problem with the internal circuit.
○ ○
▼ A B C
● ● ● ● ● ●
Problem with the internal circuit.
○ ○
Flame signal sensed out of
▼ A B C
● ○ ○ ○ ● ○
proper sequence.
○ ○
▼ A B C
ECO activated.
● ○ ○ ● ● ●
○ ○
One of the temperature adjust
▼ A B C
● ○ ● ● ○ ○
buttons stuck closed.
○ ○
▼ A B C
Water temperature sensor is either open
● ○ ● ● ○ ●
or short circuited.
○ ○
▼ A B C
● ○ ○ ● ○ ●
Unit shuts down.
○ ○
▼ A B C
● ○ ○ ○ ○ ●
Unit shuts down and in lockout.
CAUTION: Make certain power to water heater is "OFF" before removing protective cover FOR ANY REASON.
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 connectors or other
safety devices. Refer repairs to qualified service personnel.
32
Problem
1. Check that the earth ground connection is properly
2. Check that the ground conductor on the water
1. Check proper connection of line
2. Check that the water heater is securely connected
1. Pressure switch wiring is incorrect.
2. Replace pressure switch.
1. Pressure switch wiring is incorrect.
2. Pressure switch tubing is not connected correctly.
3. Air intake or exhaust obstructed.
1. Check that all wiring is correct and secure.
2. Replace hot surface ignitor.
1. Gas supply is off or too low to operate.
2. Hot surface ignitor not positioned
3. Low voltage to the water heater.
4. Electric polarity to unit is incorrect - test and cor-
5. Combustion shut-off device tripped, contact ser-
1. Turn power to the water heater off for 10 seconds
2. Replace gas control valve.
1. Turn power to the water heater off for 10 seconds
2. Replace gas control valve.
1. Turn power to the water heater off for 10 seconds
2. Replace gas control valve.
1. Replace gas control valve.
1. Replace gas control valve.
1. Press and release each of the buttons once.
2. Replace gas control valve.
1. Check that all wiring is correct and secure.
2. Replace gas control valve.
1. Check for correct wiring to FV sensor.
2. Check for open circuits to FV sensor.
3. Replace FV sensor.
1. FV sensor detected presence of flammable vapors.
2. Contact a service agency.
Solution
connected.
heater is properly connected.
neutral and hot wires.
to earth ground.
correctly.
rect.
vice agency.
and then back on.
and then back on.
and then back on.
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