120 vac to ignitor (continued), 120 vac to ignitor from speed reduction board – A.O. Smith 960 through 967 User Manual

Page 31

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BTH S E R V I C E H A N D B O O K

STEP 10B

T R O U B L E S H O O T I N G

120 VAC TO IGNITOR (CONTINUED)

BTH 250, 962 & 966 SERIES ONLY

(Models equipped with blower speed reduction board)

120 VAC TO IGNITOR FROM SPEED REDUCTION BOARD

BTH 250, 962 & 966 Series only

Blower Speed Reduction Board

STEP 10B: CHECK FOR 120 VAC TO IGNITOR FROM PIN 1 AND 2 ON BLOWER SPEED
REDUCTION BOARD CN5 TERMINAL.

Condition:

• Reconnect CN5 plug on control board.

• Disconnect CN5 plug from blower speed reduction board.

• On/Off switch is on.

• Call for heat is activated.

• Perform test during ignitor warm up period — blower should be running at reduced speed.

IF...

THEN

120 VAC is not present

replace the blower speed reduction board if Step 10A
has been performed and results were successful.

120 VAC is present

continue to Step 11.

Technical Training Department
TC-044 Revision 6

A. O. Smith Water Products Co.

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