Hayward H400FDN Universal H Series Troubleshooting Guide - Page 8

UHS Sequence of Operation: Failure to Light - if code

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UHS Sequence of Operation: Failure to Light If trial fails: 1. Gas valve de-energizes (for 30 second, blower post purge). 2. Starts over at #2 of heating mode sequence. 3. Retries 3 times until lockout (IF code). 4. Waits 60 minutes then retries 3 more times. 5. Will continue to retry every 60 minutes, until demand for heat is stopped. NOTE: When making keypad entries of any type there may be a 5-10 sec delay for certain situations. 8

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If trial fails:
1.
Gas valve de-energizes (for 30 second, blower post purge).
2.
Starts over at #2 of heating mode sequence.
3.
Retries 3 times until lockout (IF code).
4.
Waits 60 minutes then retries 3 more times.
5.
Will continue to retry every 60 minutes, until demand for heat is
stopped.
NOTE: When making keypad entries of any type there may be a 5-10 sec delay for
certain situations.
8
UHS Sequence of Operation: Failure to Light