Start with the symptom: radiators cold at the top or bottom, a boiler that will not stay on, banging, or no hot water — what to check first, and when to call a professional.
By the FaultToFix team | Published: 26 October 2026 | Last updated: 26 October 2026 DIY level: Easy to diagnose · Moderate to balance · Cost: £0 to check · ~£10 in tools to balance · Time: 20 minutes to diagnose · ~1 hour to balance a typical house Quick Answer: When one room never … Read more
By the FaultToFix team | Published: 26 October 2026 | Last updated: 26 October 2026 DIY level: Easy (bleeding) · Cost: £0–£5 (a radiator bleed key) · Time: 15–30 minutes for the house Quick Answer: A gurgling or bubbling radiator is almost always trapped air sitting at the top of the radiator, with the heating … Read more
By the FaultToFix team | Published: 26 October 2026 | Last updated: 26 October 2026 DIY level: Diagnosis only — every check happens outside the boiler · Cost: £0 to diagnose · Engineer costs at the end, if it comes to that · Time: 10 minutes per check, plus 3 heating cycles of logging Quick … Read more
By the FaultToFix team | Published: 26 October 2026 | Last updated: 3 November 2026 DIY level: Easy · Cost: £0 if the pin frees · £10–£30 for a replacement TRV if it doesn’t · Time: 5–15 minutes Quick Answer: If one radiator stays stone cold while the rest of the house heats up, the … Read more
By the FaultToFix team | Published: 26 October 2026 | Last updated: 26 October 2026 DIY level: Easy to diagnose · Moderate to flush one radiator · Cost: £0 to check · ~£15–£20 inhibitor · £350–£600 professional powerflush · Time: 10 minutes to diagnose · ~1 hour to flush one radiator Quick Answer: A radiator … Read more