A.O. Smith BTH 150 - Transformer

A. O. Smith Water Products Company Service Handbook
Irving, Texas 2000© Training Department
22
TROUBLESHOOTING
STEP 6. 24 VAC FROM CONTROL BOARD TERMINAL CN3 TO E.C.O.
Plug to CN 3 disconnected. (Energy Cutoff)
Check for 24 VAC red terminal 4 to ground on CN 3 terminal (red wires are the ECO wires).
STEP 6 - CONTROL BOARD TEST
STEP 5 - 24 VAC FROM TRANSFORMER
STEP 5. 24 VAC FROM TRANSFORMER
24 VAC transformer indicator light should be "on".
Insert probe into back of connect. Check for 24 VAC
blue wire connect to ground and yellow wire connect
to ground.
IF… THEN
blue to ground does not have 24 VAC replace tran
s
blue to ground does have 24 VAC continue
yellow to ground does have 24 VAC replace tran
s
yellow ground does not have 24 VAC
g
o to Step 6
.
Meter Should
Read 24 VAC