05 Air Filter Error
Follow the procedure in the “Air Screen” section of the owner’s manual.
If the error code continues to flash after cleaning the air filter, review
the items in “Code 10” or contact a qualified service technician.
07 Circulation Flow Rate has dropped below 2.1 gpm
Check water filter for blockage
Check pump operation and wiring
Clean Heat Exchanger
10 Air Supply or Exhaust Blockage
Ensure listed 4" b-vent is used and there are no reductions in the vent
system
Check that nothing is blocking the vent, inlet screen or “Combustion Air
Assembly”
Check all vent components for proper connections.
Check fan for blockage
Ensure vent length, vent size and combustion air comply with the
requirements stated in the
National Fuel Gas Code, ANSI Z223.1/NFPA 54
,
or the
Natural Gas and Propane Installation Code, CSA B149.1
.
11 No Ignition
Check that the gas is turned on at the water heater, gas meter, or cylinder.
Ensure gas type and pressure is correct.
Ensure gas line, meter, and/or regulator is sized properly.
Bleed all air from gas lines.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Ensure igniter is operational.
Check igniter wiring harness for damage.
Check gas solenoid valves for open or short circuits.
Remove burner cover and ensure all burners are properly seated.
Remove burner plate and inspect burner surface for condensation or debris.
12 Flame Failure
Check that the gas is turned on at the water heater and gas meter. Check for
obstructions in the flue outlet.
Ensure gas line, meter, and/or regulator is sized properly.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure vent length, vent size and combustion air comply with the
requirements stated in the
National Fuel Gas Code, ANSI Z223.1/NFPA 54
,
or the
Natural Gas and Propane Installation Code, CSA B149.1
.
Verify dip switches are set properly.
Ensure appliance is properly grounded.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Disconnect and reconnect all wiring harnesses on unit and PC board.
Check for DC shorts at components.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface for condensation or debris.
13 Combustion Error
Review items listed under codes “05” and “10”
FE Flammable Vapors Detected
•
Leave the area immediately, leaving the exit point open to allow
ventilation
•
Do not touch any electric device (including phone or light switch)
•
Call emergency personnel from a neighbors phone
•
Do not try to reset the water heater or light the pilot to any other
appliance
When safety personnel have identified the area as safe and all flammable
vapors have been evacuated the units can be rest by unplugging the unit
then plugging back in.
If “FE” continues to flash after area is determined safe, contact a qualified
service technician.
16 Over Temperature Warning
Check gas type of unit and ensure it matches gas type being used.
Check for restrictions in air flow around unit
Check for foreign materials in combustion chamber and/or exhaust piping.
Check for clogged heat exchanger.
30 FV Sensor Error
Check sensor wiring for damage.
Measure resistance of sensor.
Replace sensor.
31 Burner Sensor Error
Measure resistance of sensor.
Replace sensor.
32 Heat Exchanger Outgoing Temperature Sensor Fault
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
35 Tank Temperature Sensor Fault
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
38 CO or FV Sensor Error
Check sensor wiring for damage.
Measure resistance of sensor.
Replace PCB and sensors.
52 Modulating Solenoid Valve Signal Abnormal
Check modulating gas solenoid valve wiring harness for loose or damaged
terminals.
Measure resistance of valve coil.
61 Combustion Fan Failure
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
63 Circulation Flow Rate has dropped below 1.2 gpm
Check water filter for blockage
Check pump operation and wiring
Clean Heat Exchanger
71 SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault
Check wiring harness to all solenoids for damage and/or loose connections.
Measure resistance of each solenoid valve coil.
72 Flame Sensing Device Fault
Ensure flame rod is touching flame when unit fires.
Check all wiring to flame rod for damage.
Remove flame rod and check for carbon build-up; clean with sand paper.
Check inside burner chamber for any foreign material blocking flame at flame
rod.
Measure micro amp output of sensor circuit with flame present.
Replace flame rod.
73 Burner Sensor Circuit Error
Check sensor wiring and PCB for damage.
Replace sensor.
NO CODE No hot water
Confirm the water heater is plugged in and 120 volts is available.
14 Thermal Fuse
Check gas type of unit and ensure it matches gas type being used.
Check for restrictions in air flow around unit and vent terminal.
Check for low water flow in a circulating system causing short-cycling.
Ensure dip switches are set to the proper position.
Check for foreign materials in combustion chamber and/or exhaust piping.
Check heat exchanger for cracks and/or separations.
Check heat exchanger surface for hot spots which indicate blockage due to
scale build-up. Refer to instructions in manual for flushing heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
