Rheem GTC Series- Installation Manual

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

1 of 5

Intelli-Vent Trouble Chart FVIR AOS.fm

#

LED STATUS

PROBLEM

SOLUTION

1

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.

2

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.

3

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.

4

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.

5

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.