A pool heater tends to reveal its problems at the worst possible moments: the morning before guests arrive, the first cold week of fall when the pool would otherwise be perfect, or after it's sat dormant for months and the ignition components have corroded. Common symptoms include a heater that lights and immediately shuts off, one that runs but doesn't reach setpoint, or one that displays a pressure switch or water flow error code. Gas valve problems, failed ignition control modules, degraded thermal regulators, and cracked heat exchangers all produce codes and symptoms that look similar on the surface but point to very different repairs underneath.
Pool heater repair at K&D Quality starts with confirming the actual fault rather than replacing parts by process of elimination. Raypak, Pentair MasterTemp, Hayward Universal H-Series, Jandy LXi, and Jandy JXi are all on the service list, and the components that account for the majority of failures are stocked on the truck. When a repair isn't cost-effective relative to the age and condition of the unit, full replacement is available, and new gas line runs can be handled through a licensed sub when the existing supply isn't adequate for a higher-BTU replacement. Full heater replacements run one to two days from pull to startup.
San Jose pool owners who heat their pool get more usable weeks out of the year, but that extended season puts more hours on the heater than most people account for. Pool heater repair in the South Bay often comes down to catching ignition and pressure-switch issues before they cascade—an ignition module that's borderline won't show up as a fault until it fails completely, usually in cool weather when the heater is running most. A heater that's been properly diagnosed and repaired should light cleanly, reach setpoint without cycling, and shut down without error. That's the baseline a comfortable pool season is built on.
