Hot water troubleshooting guides
Diagnose hot water problems including no hot water, inconsistent temperatures and hot water pressure issues.
Common problems
No hot water (combi boiler): quick checks
Advice Hub / Hot Water No hot water (combi boiler): quick checks Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary If your combi has power and no fault showing, check hot tap flow, system pressure, and whether the boiler responds to DHW demand. Safety first Smell gas or suspect