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SBD TANK TYPE HEATERS
SERVICE HANDBOOK
Technical Training Department
Ashland City, TN ©2003
39
STEP 18A MAIN GAS VALVE CHECK
SBD 120 – 400 GAS VALVE
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.
NEHT FI
The meter reads ‘O’ or infinity • Replace the gas valve
The meter reads 68* ohms plus or minus 5 • The main burner will ignite
TH
TR