State Industries SBD85 500 - Manual (Page 20)

SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
19
TROUBLESHOOTING SBD WATER HEATERS
To troubleshoot a SBD water heater check that:
•
120 VAC is supplied to the heater
•
the tank is full of water
•
gas is supplied to the unit
STEP 1 TEST THE TRANSFORMER
STEP 1 - TO TEST THE TRANSFORMER - Using a multimeter, test for 24 VAC
between the secondary transformer terminals.
IF THEN
The meter does not read 24 VAC:
•
Check that the 120 VAC is supplied
from the On/Off Switch – if not, replace
switch.
•
Check that the 120 VAC is supplied
from transformer.
The meter reads 24 VAC:
•
Go to step 2.