--- title: "Boiler Sensor Replacement | Northstar Plumbing" description: "Diagnose faulty boiler sensors and replace temperature, pressure or flow sensors to restore safe heating and hot water with clear pricing." canonical: "https://www.northstarplumbing.co.uk/services/boiler-sensor-replacement" --- ![Left hand adjusts white boiler thermostat dial; digital display reads 75°C and pressure gauge at right](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Fhand-adjusting-boiler-thermostat-75c.jpg%3Fv%3D1768575125723&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ) Boiler Repairs & Faults # Boiler Sensor Replacement [Contact Us](https://www.northstarplumbing.co.uk/redirect) Boiler sensor replacement identifies and fixes sensor faults that can cause lockouts, temperature swings, low pressure warnings, or intermittent hot water. The service focuses on accurate diagnosis, safe replacement of the failed sensor, and checks to confirm your boiler is running correctly again. ## What boiler sensor replacement covers A boiler relies on sensors to monitor temperature, pressure, and water flow. When one fails or drifts out of range, the boiler can shut down or operate unpredictably. This service is designed to restore safe, stable heating and hot water. - Read fault codes and symptoms to pinpoint the likely sensor issue - Test temperature, pressure, and flow readings and related wiring - Replace the faulty sensor with a suitable part - Check boiler operation after repair (heating, hot water, and safety controls) - Provide clear findings and next steps if another fault is also present ### When this service is the right fit Sensor issues often show up as repeated fault codes, short cycling, unstable hot water temperature, or the boiler cutting out when demand changes. It can also help where radiators are not heating evenly due to control and temperature feedback problems. If you are a landlord or manage a small property portfolio, fast diagnosis can help reduce downtime and avoid repeat call-outs. ### What happens during the visit The engineer will start with a structured fault finding check, using the boiler’s diagnostics alongside physical testing to confirm whether the sensor is at fault or if another component is causing the same symptom. Once confirmed, the failed sensor is replaced and the system is rechecked under normal running conditions. Any gas work is completed by a Gas Safe registered engineer. ### After the repair You will be advised on what caused the fault where it is identifiable, and what to watch for over the next few days. If the sensor failure points to a wider issue (such as pressure problems, circulation faults, or scale), you will get practical options for resolving it. This helps prevent the same error returning and supports longer, more reliable boiler performance. [Contact Us](https://www.northstarplumbing.co.uk/redirect) ## Frequently Asked Questions How do I know if a boiler sensor has failed? Common signs include recurring fault codes, the boiler locking out, hot water that swings between hot and cold, or radiators that do not heat consistently. A proper diagnosis is needed because different faults can trigger similar symptoms. Can you replace a sensor without replacing the whole boiler? In many cases, yes. If the boiler is otherwise in good condition and parts are available, replacing the failed sensor can restore normal operation without a full replacement. How long does a boiler sensor replacement take? Many sensor replacements can be completed in a single visit once the fault is confirmed and the correct part is available. If further faults are found, you will be updated before any additional work is carried out. Is it safe to keep using the boiler if it shows a sensor fault? It depends on the fault and symptoms, but it is best to avoid repeated resets and arrange a check. A faulty sensor can cause overheating, poor combustion control, or nuisance shut-downs, and continued use may risk further damage. Will replacing a sensor affect my boiler warranty? Using the correct parts and completing the work safely should not affect warranty, but terms vary by manufacturer and installer. Keep records of the repair, and ask if manufacturer-approved parts are recommended for your model. 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