Some sites may require a pressure switch
adjustment. IF adjustment does not correct or was
not required, go to 11D.
Inspect and test high limits
Inspect & test high limits. Verify continuity across
the temperature limit switches. IF open or wire is
damaged, replace (pg. 20). IF OK, go to 11E.
Pressure switch adjustment
Step 11C
IF this heater is installed in an indoor application,
proceed to step 11F. IF heater is installed in an
outdoor environment, go to step 11I.
Indoor application?
Step 11E
49
Applies To Indoor Installations ONLY: Inspect the
vent pressure switch tube connections. IF OK, go to
11G. IF NOT, repair/replace tubing (pg. 20).
Vent pressure switch/tubing
Step 11F
Step 11D
11. Service LED ON: “LO” Code (cont.)
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