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Hello. I stumbled across this forum while trying to troubleshoot a pool issue. We live in Georgia and have had our pool for a little over 12 years.

We have an H400FDN pool heater. It is 12 years old and is used about 4-8 times per year. It worked this summer but stopped this fall. If we pull the small cover on the left side (igniter access baffle?), the unit will light but only the left half of the burners appear to be lit. The left...