Troubleshooting, Pre-service tips, 120 vac to control – A.O. Smith 960 through 967 User Manual
Page 19: M. -a, 120 vac to control board
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BTH S E R V I C E H A N D B O O K
T R O U B L E S H O O T I N G
TROUBLESHOOTING
PRE-SERVICE TIPS
CHECK THAT:
• Insure 120 VAC power supply has correct polarity — check neutral
(white) wire to ground with volt meter. It should read “0” volts.
• Tank is full of water
• Exhaust and intake vent do not exceed allowable limits
• All plugs into boards are secure
• Condensate hose is drained and open
• Proper (natural or propane) gas is supplied
120 VAC TO CONTROL
STEP 1
120 VAC TO CONTROL BOARD
j1 2 3 4 N«!
M. -a«*-
1
2
12 3 4
:1|CN4
■
.
■ ^
i
t
;
*
ViiRitcB*
iCN2 .
12 3
■ ■
■ Black
" White
" Green
mt
. 0 , ■
CN1
j
i.mi
TR'ig
• G 5 4
•
To Juiiction Box
STEP 1: CHECK FOR 120 VAC TO CONTROL BOARD CN1 TERMINAL.
Condition:
• Disconnect plug from CN1 terminal.
• On/Off switch is on.
Check for 120 VAC black wire terminal white wire on plug.
IF...
THEN
120 VAC is not present
check On/Off switch, turn switch on, replace On/Off switch if defective, restore
power to the water heater.
120 VAC is present
reconnect CN1 plug, continue to Step 2.
Technical Training Department
TC-044 Revision 6
18
A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004