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SUF SERVICE HANDBOOK
TROUBLESHOOTING
Technical Training Department State Water Heaters
STC-077
24 Ashland City, Tennessee © 2004
PRESSURE SWITCH CONTINUITY
STEP 7: CHECK FOR CONTINUITY BETWEEN PRESSURE SWITCH TERMINALS WITH
WIRES REMOVED.
Condition:
• On/Off switch is off.
• All wires are disconnected from all pressure switches.
• Multimeter is set to lowest ohms scale.
STEP 7 PRESSURE SWITCH CONTINUITY TEST
IF… THEN
blocked inlet switch does not show continuity replace switch.
blocked inlet switch does show continuity continue.
blower proving switch does show continuity replace switch.
blower proving switch does not show continuity continue.
low gas pressure switch does not show continuity
check for minimum supply gas
pressure of
5.0” W.C. natural gas
9.0” W.C. LP gas
replace switch if gas pressures
are above these minimums.
low gas pressure switch does show continuity continue.
blocked outlet pressure switch does not show continuity replace switch.
blocked outlet pressure switch does show continuity
reconnect all wires to pressure
switches; continue to Step 8.