A.O. Smith INTELLI-VENT, Troubleshooting Manual, Page: 31 / 46

TB-A028-06 - A. O. SMITH - FVIR INTELLI-VENT TROUBLESHOOTING CHART
A. O. Smith Water Products Company AHSTB02807 Technical Training Department
Ashland City, Tennessee © 2006 3 of 5 Intelli-Vent Trouble Chart FVIR AOS.fm
Flammable Vapor Sensor Location / Testing
# LED STATUS PROBLEM SOLUTION
14
The self diagnostic test has
detected the flammable vapor
sensor is either open or shorted.
The Intelli-Vent control is
programed to lock-out and
display this error code if the
resistance value it senses from
the FV sensor is below 5,000
ohms or above 1,700,000 ohms.
Service Note: To perform this
test the ohm meter used must be
capable of reading up to
2,000,000 ohms.
1 Turn off power to the water heater. Ensure all FV
sensor wiring, the ignitor assembly plug, and the
ignitor assembly socket on the bottom of the Intelli-
Vent™ control are making good contact. Repair or
replace any worn/damaged components that are not
making a good connection.
2 Restore power to the water heater - if the error code
has cleared place the water heater back in operation
and allow it to cycle several times to ensure the
problem has been resolved. If the error code persists
- continue to step 3 below.
3 Turn off power to the water heater. Remove the FV
sensor from it’s bracket on the base ring of the water
heater and disconnect both wires to the sensor. Take
a resistance reading between the two wiring
terminals of the FV sensor and note the resistance
value.
Service Note: Unless the ohm meter used has an
auto-range feature the resistance should be checked
twice. The first reading will be taken using an ohms
scale above 1,700,000 ohms. The second reading is
taken using an ohms scale just above 5,000 ohms.
4 If resistance of the FV sensor is lower than 5,000
ohms - replace the FV sensor.
5 If resistance of the FV sensor is above 1,700,000
ohms - replace the FV sensor.
6 If the resistance of the FV sensor is above 5,000
ohms and lower than 1,700,000 ohms and all the
above steps have been performed - ensure the
wiring and plug between the sensor and the Intelli-
Vent™ control are not damaged or worn - replace the
ignitor assembly if the wiring and/or plug are
damaged/worn.
If the wiring and plug are in good condition - replace
the Intelli-Vent™ control valve