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INTELLI-VENT TROUBLESHOOTING GUIDE

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TECHNICAL BULLETIN - IGNITION AND FLAME FAILURE

A-022-04 & S-021-04 COMBINED

This technical bulletin has been prepared to help diagnose and repair ignition and flame

failure problems with White Rodgers Intelli-Vent equipped water heaters. Procedures to

verify correct flame sensor alignment, burner assembly condition, and flue

restrictor/baffle position are outlined in this bulletin. These procedures should help to

identify and repair most ignition and flame failure problems.

Always verify an adequate supply of fuel gas (manifold gas pressure) and combustion air

when experiencing ignition or flame failure.

Procedures for verifying an adequate supply of fuel gas and combustion air are detailed

in the residential gas service handbook (A. O. Smith part number TC-049 R3, State

Water Heaters part number STC-080) available through your local A. O. Smith or State

Water Heaters sales representative or as free download from the web sites:

www.aosmithwaterheaters.com

www.statewaterheaters.com

If it is determined there is not a sufficient supply of combustion air or fuel gas, resolve

these problems first. The test procedures outlined in this technical bulletin presume there

is an adequate supply of both fuel gas and combustion air.

FLAME SENSOR ALIGNMENT

(Intelli-Vent™ equipped - standard recovery - 40 & 50 gallon residential water heaters)

The lower lip or edge of a low NOx burner extends out further than it does on a standard

burner. Flame sensor gap and elevation are measured from the lower lip on low NOx

burners and from the top lip on standard burners as illustrated on the following page.

The A. O. Smith Water Heater specifications given here are for standard recovery

residential power vent and power direct vent 40 and 50 gallon models. GPSH 40, GPSH

50, GPDH 40, GPDH 50. Call the A. O. Smith Water Heaters technical information

center (800 527-1953) for information on other models.

The State Water Heater specifications here are for standard recovery residential power

vent and power direct vent 40 and 50 gallon models. PR6 40 & 50 XCVIT (natural) or

CCVIT (propane), PR6 40 & 50 XBPDT (natural) or CBPDT (propane). Call the State

Water Heaters technical information center (800 365-0577) for information on other

models.

A. O. Smith

State

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