Toilet troubleshooting guides
Troubleshoot weak flushes, slow cistern refill, running toilets and other common toilet faults with step-by-step checks.
Common problems
Toilet weak flush or slow refill: quick checks
Advice Hub / Toilets Toilet weak flush or slow refill: quick checks Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary A slow refill usually points to a supply-side issue such as a restricted inlet, partially closed isolation valve, or faulty fill valve. A weak flush usually points to low
Toilet won’t stop running: likely causes
Advice Hub / Toilets Toilet won’t stop running: likely causes Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary If the cistern keeps refilling, first check whether water is escaping into the pan (flush seal) or out of the overflow. Safety first Know where your toilet isolation valve (if fitted)