Hayward H400FDN Universal H Series Troubleshooting Guide - Page 49

Service LED ON: LO Code cont.

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11. Service LED ON: "LO" Code (cont.) Pressure switch adjustment Step 11C Inspect and test high limits Step 11D Some sites may require a pressure switch adjustment. IF adjustment does not correct or was not required, go to 11D. Indoor application? Step 11E 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. Vent pressure switch/tubing Step 11F 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. 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).

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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.)