In This Guide
The Worcester H07 error code is a software-related fault commonly associated with incorrect or missing range rating settings on your Worcester Bosch boiler. This error can also be linked to faults or compatibility issues in the boiler identification module (KIM), sometimes referred to as the kim boiler identification module, and may involve the control unit or KIM in system errors or fault detection related to the H07 code. This error prevents the boiler from functioning properly and often points to an issue with the control board configuration or a faulty code plug. At 0800 Homefix, we routinely resolve Worcester H07 faults to restore safe and efficient boiler performance.
What Is the H07 Error on a Worcester Bosch Boiler?
The H07 fault code appears when the boiler detects a problem with:
- Software calibration or firmware configuration
- Range rating parameters that control heat output
- Incorrect or missing code plug (a small chip inserted in the control board)
Common search terms include:
- Worcester H07 error code
- Software fault H07 Worcester
- H07 on Worcester boiler
- Worcester boiler software issue
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This fault is more frequent in Worcester Greenstar i and CDi Compact models.
Likely Causes of the H07 Fault Code: Flow Temperature Sensor Issues
- Incorrect code plug installed: The chip might not match the boiler model or rating.
- No code plug detected: Sometimes caused by a loose or oxidised connection.
- PCB firmware fault: Software issues on the Printed Circuit Board (PCB).
- Control box error or heat control module fault: A control box error or a fault in the heat control module can also trigger the H07 code.
- Electrical surge or data corruption: Can reset or erase calibration data.
- Wiring integrity or control box connections: Faulty wiring or poor control box connections can lead to detection issues and should be checked as part of diagnosing the fault.
- Poor installation: Non-standard setup or tampering can cause misconfiguration.
Boiler Symptoms When H07 Appears
- Boiler fails to ignite or heat
- Error H07 displayed consistently
- Heating controls unresponsive
- May intermittently restart or lock out
Safe Checks Before Calling a Gas Safe Engineer
- Reset the boiler once to see if the error clears
- Ensure no recent electrical changes or power surges occurred
- Do not attempt to remove or change the code plug yourself
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How 0800 Homefix Boiler Repair Service Resolves the H07 Error
Our certified engineers use advanced diagnostic tools to:
- Test and replace the code plug if it’s incorrect or damaged
- Reset or update the PCB firmware
- Verify correct range rating settings for your home
- Check wiring integrity between components
- Check the pressure sensor connection and ensure it is secure and functioning
- Inspect cabling and plug sensors for faults or poor connections as part of the diagnostic process
- Ensure compatibility between installed parts and software
We use only manufacturer-approved components to ensure long-term reliability.
Preventing Software-Related Boiler Error Codes
- Always use a Gas Safe engineer for installation and repairs
- Avoid DIY configuration or fitting of spare parts
- Schedule regular maintenance to verify software and hardware integrity
- Use a surge protector to avoid electrical damage to sensitive boiler components
Frequently Asked Questions
What does H07 mean on a Worcester boiler?
Can I reset the H07 fault code myself?
Is the H07 error dangerous?
Can 0800 Homefix fix it the same day?
If your Worcester boiler is showing H07, don’t ignore this software fault. Call 0800 Homefix today for fast, expert repairs and ensure your home heating stays reliable and safe.
Worcester Bosch Official site here
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Editorial note: This article is intended as a general homeowner guide. All plumbing work on supply pipes should be carried out by a qualified, WaterSafe-registered plumber. If you suspect a gas leak, leave the property immediately and call the National Gas Emergency Service on 0800 111 999.
