How to Fix a Boiler Showing a Fault Code and Won't Reset

Overview

A boiler showing a fault code that will not reset needs diagnosis. This guide covers common fault codes and fixes.

Step-by-Step Fix

1. First, carefully observe the boiler's display panel and make a note of the exact fault code or error message shown. This alphanumeric code is crucial for diagnosing the problem, so write it down precisely before proceeding.
2. Next, locate your boiler's instruction manual or user guide, which should contain a dedicated section explaining what each fault code signifies. Find the specific code you noted earlier to understand its meaning and the manufacturer's recommended initial actions.
3. Following the instructions in your boiler's manual, firmly press the designated reset button on the control panel. Hold it for the specified duration, usually a few seconds, then release and observe if the boiler attempts to restart and clear the fault code.
4. If the boiler fails to reset or displays the same fault code immediately after attempting a reset, you need to investigate some common underlying issues. Before moving on, ensure you've given the boiler a minute or two to try and re-establish normal operation after the reset.
5. Carefully check that your gas supply is active by ensuring other gas appliances, like your hob, are working correctly; if not, check your gas meter's emergency control valve is in the 'on' position. Also, locate the pressure gauge on your boiler and confirm the reading is within the optimal range, typically between 1 and 1.5 bar, topping up the pressure if necessary according to your manual.
6. If the fault code persists despite checking common issues and attempting a reset multiple times, or if you are unsure about any steps, it's time to call in a professional. For your safety and to comply with regulations, only a Gas Safe registered engineer is qualified to diagnose and fix internal boiler faults, so book an appointment without delay.

Common Error Codes

Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.

Frequently Asked Questions