Main Gas Valve - A.O. Smith 120 trough 500 Service Handbook

STEP 18A
STEP 18A. MAIN GAS VALVE CHECK. Disconnect wires from gas valve TH and TR
terminals. Using a multimeter, test for 68 ohms plus or minus 5 between TH and TR on
the main valve coil.
IF
The meter reads 'O' or infinity
The meter reads 68* ohms plus or minus 5
A.O. Smith Water Products
Irving, Texas ©2000
BTR TANK TYPE HEATERS
SERVICE HANDBOOK
MAIN GAS VALVE CHECK
TH
BTR 120 – 400 GAS VALVE
TR
THEN
• Replace the gas valve
• The main burner will ignite
40
Service Handbook
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