Error Code 5 - Ignitor Failure; Error Code 6 - Ignition/Flame Failure - A.O. Smith INTELLI-VENT Troubleshooting Manual

INTELLI-VENT TROUBLESHOOTING GUIDE

ERROR CODE 5 - IGNITOR FAILURE

5
The Intelli-Vent™ control has detected an open ignitor circuit.
Check / Repair:
• Check all wiring to the hot surface ignitor.
• Check 5 pin Molex ignitor assembly plug and receptacle on the Intelli-Vent™ body
for a good connection. Repair or replace parts if necessary.
• Check resistance of ignitor with an ohm meter between pin 1 and 2 on the ignitor
assembly plug. Replace ignitor if resistance is not within 11.5 and 18.8 ohms.
• If above checks are good and ignitor resistance is within specification - replace
the Intelli-Vent™ control.
ERROR CODE 6 - IGNITION / FLAME FAILURE
6
The water heater has reached the maximum number of retries or recycles and is
currently locked out for one hour. Cycle the power to the water heater off and on to reset.
Check / Repair:
• Gas supply is off or too low of pressure to operate.
• Insure manifold gas pressure is present and within requirement.
• Insure the flame sensor is making good contact with the burner flame. See the
Ignition and Flame Failure bulletin on page 16 and the burner check on page 18.
• Insure the flame sensor is clean - use steel wool to clean sensor.
• Insure flue restrictor (on models so equipped - see page 19) and flue baffle are
installed properly. Flue restrictor must be flush on top of flue pipe. A disloged or
missing flue restrictor/baffle can cause excessive air turbulence in the combustion
chamber - sweeping all gas away from ignitor (no ignition) or the flame away from
the sensor (short cycling burner).
• Insure vent termination restrictor (see product notification sheets at end of this
publication) is installed when required.
• Insure the ignitor is positioned correctly for consistent ignition.
• Low voltage to the water heater. Should be 115 - 125 VAC.
Technical Training Department
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Ashland City, Tennessee © 2005