Service Type: Boiler Inspection & System Check Equipment: Viessmann Vitodens 100 High-Efficiency Combi Boiler Background: - Backflow preventer and pressure reducing valve replaced and boiler maintenance completed over one month ago. Client Concern: - Client reported loss of hot water and referenced an error related to a possible blockage. - Client stated a blockage was cleared through the boiler interface. - Client later noticed a small water drip from the boiler. - Thermostat batteries were changed and boiler reset; system has been operating normally since. Inspection & Findings: - Boiler operating normally at time of visit. - No active water leaks observed. - No visible blockage found on site. - System parameters checked and found to be set correctly. - Boiler is a combi unit used for space heating only; domestic hot water piping is capped. - Boiler displays error code 4.7 (no domestic hot water), which is expected as domestic side is not in use. - Space heating operation is una