I successfully adjusted the limit stop for the downstairs shower, ensuring it operates smoothly and efficiently. This adjustment addressed the issue of the shower not shutting off properly, enhancing both safety and user experience. Additionally, I cleared the fail code on the tankless water heater, which had been displaying an error message. This involved diagnosing the root cause of the error, making necessary adjustments, and confirming that the system was functioning correctly. The water heater is now operating without any issues, providing consistent hot water supply.