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 side of the vent is hot. The right side of the vent is cool. If the cover is in place, it will not ignite. If we remove the cover, it will ignite and stay on until the cover is replaced.
We have replaced the regulator, thermistor, and blower vacuum switch. We have had people come out to troubleshoot/repair it but they have not been able to solve the problem. I have checked the burner orifice and the burners to make sure they were clean and they are.
Any suggestions on what to check next?
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 side of the vent is hot. The right side of the vent is cool. If the cover is in place, it will not ignite. If we remove the cover, it will ignite and stay on until the cover is replaced.
We have replaced the regulator, thermistor, and blower vacuum switch. We have had people come out to troubleshoot/repair it but they have not been able to solve the problem. I have checked the burner orifice and the burners to make sure they were clean and they are.
Any suggestions on what to check next?