Free diagnostic tool
Type your problem — get a diagnosis
Free · Built by a Gas Safe Engineer
Diagnose your plumbing
problem in seconds.
🔧A clear fix you can do yourself — step by step
💬A plain-English explanation to take to a plumber, with a rough cost estimate
⏱Takes 2 minutes
✓Completely free
🔒No sign-up
or describe your problem
More tools
⭐Pro Guides
Fix it yourself — save £100s
Step-by-step repairs from a Gas Safe engineer. Unlock all for less than a coffee a month.
→Annual boiler service — what happens and what it costssaves ~£120
→Dripping compression fittingsaves ~£20
→Diverter valve fault — no hot water (combi boiler)saves ~£350
→Immersion heater not heating watersaves ~£100
→Hot Water Cylinder Not Heating Upsaves ~£350
Online Courses
SoonLearn how your heating & plumbing works — from £14.99
🚨Plumbing emergency?