A.O. Smith INTELLI-VENT, Troubleshooting Manual, Page: 7 / 46

INTELLI-VENT TROUBLESHOOTING GUIDE
Technical Training Department Ashland City, Tennessee © 2005
6 of 24
INTELLI-VENT™ WIRING CONNECTIONS
FEMALE MOLEX RECEPTACLES
BOTTOM OF CONTROL
1. = Air Pressure Switch Circuit
2. = 120 VAC Neutral Wire to Blower
3. = 120 VAC Hot Wire to Control
4. = Air Pressure Switch Circuit
5. = 120 VAC Hot Wire to Blower
6. = 120 VAC Neutral Wire to Control
There are two female Molex plug receptacles on the bottom of the Intelli-Vent™ control. Keep in
mind the receptacles (female) and plugs (male) are mirror images of each other in regard to pin
number location and retaining clip orientation. Pin numbers and corresponding component wiring
are detailed above in relation to the retaining clip.
The male plug ends from the 6 conductor wire harness and 5 conductor ignitor assembly plug are
shown above; notice the raised ridges identifying the #1, #2, and #3 pins. A black marker was
used to highlight these ridges for the photograph.
Service Notes:
The Black Resistor Wire on the ignitor assembly plug is used to provide proper sensory input in
place of optional external variable resistance devices, none are currently used. This resistor wire
must not be cut, removed, or jumpered. The Intelli-Vent control would interpret this as a
component failure and lock out displaying error code 14 or 15.
Pins and sockets inside the plugs and receptacles should be visually inspected to insure good
connections are being made when servicing.
Always depress retaining clip when unplugging
Molex connectors, failure to do so can damage plug connection.
Ignitor Assembly
Connections
Wiring Harness
Connections
1. = Ignitor hot wire
2. = Ignitor neutral wire
3. = Resistor wire
4. = Resistor wire
5. = Flame sense rod
Black Resistor Wire
(between pin 3 and 4)
Female Receptacle
Male Plug
Male Plug
Female Receptacle