Troubleshooting and fixing fault code T6 “Ionisation Oscillator Test”

on your Worcester Greenstar Si Compact Combi Boiler

Your Worcester Greenstar Si Compact Combi Boiler is a reliable and efficient heating system that keeps your home warm and provides hot water. However, like any complex equipment, it may encounter faults from time to time. One such fault is the T6 fault code, indicating an issue with the ionisation oscillator. In this blog post, we will explore the T6 fault in detail, identify red flags to watch out for, offer troubleshooting tips, and guide both homeowners and engineers on how to address this fault effectively.

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What is the Fault?

The T6 fault code on your Worcester Greenstar Si Compact Combi Boiler refers to a problem with the ionisation oscillator. The ionisation oscillator is a component responsible for detecting and measuring the ionisation of the burner flame. This measurement helps ensure the boiler operates safely and efficiently. When a fault occurs with the ionisation oscillator, the T6 fault code is triggered.

Red Flags!

Looking for a reason as to why your boiler is flashing T6? Here are some red flags:

  1. Intermittent ignition: If your boiler exhibits inconsistent ignition, with the burner occasionally failing to ignite or repeatedly going on and off, it may be a sign of a faulty ionisation oscillator.
  2. Flame sensing issues: A malfunctioning ionisation oscillator may struggle to detect the flame or provide inaccurate readings. This can result in a weak or unstable flame, which may lead to further problems with heating and hot water production.
  3. Complete loss of heating: When the ionisation oscillator is not functioning correctly, the boiler may shut down completely, resulting in a total loss of heating in your home.
  4. Frequent lockouts: If your boiler frequently goes into a lockout state, requiring manual intervention to reset it, it could be a symptom of a faulty ionisation oscillator.
  5. Error codes and warning lights: In addition to the T6 fault code, other error codes or warning lights may appear on the boiler’s control panel, indicating an issue with the ionisation oscillator.

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Troubleshooting Tips:

Here are five troubleshooting tips to help you address the T6 fault on your Worcester Greenstar Si Compact Combi Boiler:

  1. Reset the boiler: Try resetting the boiler by turning off the power for a few seconds and then turning it back on. Sometimes, a temporary glitch can be resolved with a reset.
  2. Check the gas supply: Ensure that your gas supply is sufficient and not interrupted. A weak or interrupted gas supply can impact the performance of the ionisation oscillator.
  3. Clean the burner: Remove any dust, debris, or carbon buildup from the burner assembly. Accumulated residue can interfere with the proper functioning of the ionisation oscillator.
  4. Verify electrical connections: Inspect the electrical connections associated with the ionisation oscillator. Loose or damaged connections can cause faults and impact its performance.
  5. Consult the user manual: Refer to the boiler’s user manual for specific troubleshooting steps and guidance related to the T6 fault code. It may provide additional troubleshooting tips or safety precautions.

What can you do as a Homeowner?

As a homeowner, here are five things you can do to address the T6 fault on your Worcester Greenstar Si Compact Combi Boiler:

  1. Document the fault code: Note down the T6 fault code along with any error messages or warning lights that appear. This information will be helpful when seeking assistance from a heating engineer or Worcester Bosch.
  2. Try resetting the boiler: Turn the boiler off by the switch and then turn it back on, this normally resets the boiler. If the error code is still flashing after trying this, then contact an engineer for further help. 
  3. Verify warranty coverage: Check if your boiler is still under warranty. If so, contact Worcester Bosch or your installer to determine if the T6 fault is covered for repair or replacement.
  4. Schedule professional servicing: Regular boiler servicing is essential to maintain its optimal performance. Arrange for a professional heating engineer to inspect and service your boiler, including the ionisation oscillator.
  5. Ensure safety precautions: If you notice any signs of gas leaks, strong odours, or other safety concerns, immediately turn off the boiler, ventilate the area, and evacuate the premises. Contact the gas emergency hotline and follow their instructions.

What to do as a Qualified Gas Engineer?

When the T6 fault persists, it is advisable to enlist the help of a qualified heating engineer. Here are five actions an engineer can take to address the issue:

  1. Thorough diagnostic check: As an engineer, perform a comprehensive inspection of the ionisation oscillator, checking for faults or defects that may be causing the T6 fault code.
  2. Ionisation oscillator replacement: If the ionisation oscillator is determined to be faulty, the engineer will replace it with a compatible and reliable component.
  3. Verify burner flame: The engineer will ensure that the burner flame is stable and properly detected by the ionisation oscillator. Adjustments may be made as needed.
  4. Electrical testing: The electrical connections and components associated with the ionisation oscillator will be inspected and tested to ensure they are functioning correctly.
  5. Boiler recalibration: After resolving the T6 fault, the engineer will recalibrate the boiler to ensure it operates efficiently and safely.

FAQ's

Warranty coverage may vary. Consult your warranty documentation or contact Worcester Bosch for clarification on fault code coverage.

It is recommended to leave repairs involving the ionisation oscillator to qualified heating engineers, as they have the necessary expertise and equipment.

Repair costs can vary depending on the extent of the issue and warranty coverage. Contact a heating engineer for an accurate assessment.

Yes, a faulty ionisation oscillator can affect energy efficiency, leading to higher energy consumption and potentially increased heating costs.

Regular boiler servicing, typically once a year, is recommended to maintain optimal performance and minimise the chances of faults like the T6 code.

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