Baxi PCB - 7678800
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Product Information
Full details
This guide is for owners of Baxi Combi and System boilers, and compatible Potterton boilers, who need to replace their main circuit board. The key benefit is restoring full functionality to your boiler with a genuine OEM part. A potential caveat is that installation requires technical expertise, and incorrect fitting can lead to further issues or safety hazards. The Baxi PCB 7678800 is a genuine replacement service part designed to ensure your boiler operates efficiently and reliably.
All features
| Model Part Number | 7678800 |
|---|---|
| Brand | Baxi |
Extended Product Information
FAQs
What does a PCB do in a boiler?
The Printed Circuit Board (PCB) is the main control unit of the boiler. It processes information from various sensors and controls the boiler's functions, including ignition, heating, hot water circulation, and safety mechanisms.
How do I know if my boiler's PCB needs replacing?
Symptoms can include the boiler not firing up, displaying error codes, intermittent heating, or complete failure. A diagnostic check by a qualified heating engineer is usually required to confirm a faulty PCB.
Can I replace the Baxi PCB myself?
No, replacing a boiler's PCB is a job for a Gas Safe registered engineer or a qualified heating technician due to the electrical and gas safety risks involved.
What is the weight of the Baxi 7678800 PCB?
The weight of the Baxi 7678800 PCB is approximately 1.10231131 pounds.
Which Potterton boilers are compatible with this PCB?
This PCB is compatible with Potterton Promax Ultra 24, 28, 33, 40 Combi ErP boilers with serial numbers ending in 'DC', and Potterton Ultra System boilers in 12, 15, 18, 24, and 28KW ratings.
What should I do if the new PCB doesn't solve the problem?
If the issue persists after replacing the PCB, it's possible that another component in the boiler system is faulty, or the new PCB may not be compatible with your specific boiler model despite initial checks. Contact the qualified engineer who performed the installation for further diagnosis.
Troubleshooting
Boiler not firing up after PCB replacement
Ensure all electrical connections to the new PCB are secure and in the correct positions. Verify that the power supply to the boiler is stable and correctly connected. Confirm the boiler's fault code (if any) and consult the boiler's manual for specific troubleshooting steps related to ignition.
Intermittent heating or hot water supply
Check for loose wiring on the PCB. Ensure the boiler is receiving a stable voltage. A qualified engineer should check for other potential faults in the system (e.g., sensors, pump, diverter valve) that might be misinterpreted by the PCB.
Error codes displayed on the boiler's interface
Refer to the specific error code displayed in your boiler's user or service manual. The code will indicate the area of the fault, which may or may not be directly related to the PCB itself. A technician can help diagnose if the PCB is the cause or if it's reacting to another fault.
Boiler shuts down unexpectedly
This could indicate a safety shutdown triggered by a fault. A technician should check the flue, gas supply, overheat thermostat, and other safety devices. A faulty PCB can also sometimes trigger these shutdowns.
Pros and Cons
Pros
- Ensures guaranteed compatibility and performance with specified Baxi and Potterton models.
- Genuine part minimizes the risk of installation issues or premature failure.
- Restores full operational control and features to the boiler.
- Helps maintain boiler efficiency and safety when correctly installed.
Cons
- Requires specialized knowledge and tools for installation; not a DIY task for most users.
- Compatibility is model- and serial number-specific, requiring careful verification.
- Cost may be higher than third-party alternatives, but offers better reliability.
- Failure to install correctly can lead to further damage or void warranties.
Setup, Compatibility & Care
Compatibility Verification: Before purchasing, meticulously check your boiler's model number and serial number against the specifications listed. This PCB is specifically designed for:
- Baxi 124 and 128 Combi boilers with serial numbers ending in 'BC'.
- Potterton Promax Ultra 24, 28, 33, 40 Combi ErP boilers with serial numbers ending in 'DC'.
- Potterton Ultra System boilers in 12, 15, 18, 24, and 28KW ratings.
Installation: Installation of a boiler PCB is a complex procedure that must be performed by a Gas Safe registered engineer or a qualified heating technician. Improper installation can lead to electrical hazards, gas safety issues, or damage to the boiler. The process typically involves:
- Isolating power and gas supply to the boiler.
- Opening the boiler casing.
- Carefully disconnecting the old PCB, noting wire positions.
- Installing the new Baxi 7678800 PCB.
- Reconnecting all wiring according to the boiler's service manual.
- Reassembling the boiler casing.
- Restoring power and gas, then performing a full system test and safety check.
Care: PCBs are sensitive electronic components. Avoid exposing the boiler area to excessive moisture or dust. Regular servicing of your boiler by a qualified engineer will help ensure all components, including the PCB, operate within optimal conditions.