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TB-A028-06 - A. O. SMITH - FVIR INTELLI-VENT TROUBLESHOOTING CHART

A. O. Smith Water Products Company AHSTB02807 Technical Training Department

# LED STATUS PROBLEM SOLUTION

Inadequate or no earth ground

sensed by the Intelli-Vent™

control.

1 Ensure the wall outlet is properly grounded.

2 Ensure all ground connections/wires on the water

heater are secure.

Power supply to Intelli-Vent™

control has reversed polarity.

1 Ensure the wall outlet is properly wired.

2 Ensure all internal 120 VAC wiring connections and

wiring harness have no reversed wires. 120 VAC

“hot” wire must connect to the on/off switch.

Pressure switch circuit remaining

closed for more than 5 seconds

after heating cycle begins.

Blower does not start.

1 Ensure air pressure switch circuit wiring is correct

and the air pressure switch is not jumpered.

2 Secure power to water heater, check continuity of air

pressure switch contacts with wires disconnected.

A If pressure switch contacts show continuity (closed

circuit) replace the pressure switch.

B If pressure switch contacts are open and all wiring

is correct - turn the power off for 10-20 seconds

then on again to clear the error code - if the error

code persists replace the Intelli-Vent™ control.

Pressure switch circuit remains

open longer than 5 seconds after

the blower is energized.

Blower may run continuously

in this condition.

1 Ensure the blower is running - check for 120 VAC to

the blower when the heating cycle begins, check the

wiring. If the control does not energize the blower -

replace the Intelli-Vent™ control. If the blower fails to

start when energized - replace the blower assembly.

2 Ensure the air pressure switch sensing tube is

properly connected - not kinked or damaged.

3 Check continuity of vent temperature limit switch -

replace switch if contacts remain open under 160°F.

4 Ensure the correct size of vent pipe (2”, 3”, 4”) was

used per the installation manual for vent length.

Ensure maximum number of elbows or equivalent

feet of vent pipe has not exceeded maximum limits.

5 Ensure there are no obstructions in the vent pipe.

6 Check air pressure switch performance - check

pressure with a digital manometer - check continuity

of contacts. (see service note in left column) If the

switch proves defective - replace the air pressure

switch and/or the blower assembly as required.

7 If air pressure switch performance test results prove

the air pressure switch is working properly and error

code 4 persists - replace the Intelli-Vent™ control.

The Intelli-Vent™ control has

detected an open ignitor circuit.

1 Check wiring to the hot surface ignitor - replace

ignitor assembly if wiring is damaged or worn.

2 Check ignitor assembly plug and the socket on the

Intelli-Vent™ body for good connection. Replace

ignitor assembly and/or control if necessary.

3 Check resistance of ignitor at room temperature

(77°F) at the plug end. Replace ignitor if resistance is

not within 11.5 and 18.8 ohms at room temperature.

4 If results from the above tests were good and error

code 5 persists - replace the Intelli-Vent™ control.

Service Note:

To learn more about performing

Air Pressure Switch tests visit

our web site www.hotwater.com

to download technical bulletin

TB-A023-06 Air Pressure

Switches.

Service Note:

Secure power - disconnect one

wire from the air pressure switch

or the vent temperature limit

switch. Turn power back on -

blower should start.

Service Note:

Ignitors are wearing parts; the

resistance (ohms) of a hot

surface ignitor will increase over

time. If the resistance at room

temperature is near 18.8 ohms -

consider replacing the ignitor as a

preventative measure.

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