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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)
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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
⚠️ As the H07 error relates to the boiler’s software, only a Gas Safe registered engineer should handle diagnostics and repair.
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
FAQs
What does H07 mean on a Worcester boiler?
It refers to a software or range rating fault, usually caused by an issue with the code plug or PCB.
Can I reset the H07 fault code myself?
You can attempt one reset, but further action requires professional servicing.
Is the H07 error dangerous?
It’s not immediately dangerous but will prevent the boiler from working properly until resolved.
Can 0800 Homefix fix it the same day?
Yes. We carry most Worcester Bosch components and can resolve the H07 error in a single visit in most cases.
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