Baxi SV 150 240/272 Boiler Parts | Buyer's Guide
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For the Baxi SV 150 240/272 boiler series, the most commonly replaced spare parts are the main printed circuit board (PCB), the 3-way micro switch valve, the ignition electrode, and the 2-amp fuse. These components are critical for ignition, water flow control, and electronic regulation. 3G Electric supplies genuine-specification Baxi spare parts with international export support.
What is the Baxi SV 150 240/272 boiler series?
A Baxi SV 150 240/272 is a wall-mounted, room-sealed gas boiler designed for residential and light commercial heating. The '240' and '272' designations refer to output variants within the same chassis, typically rated between 24 kW and 27.2 kW. These boilers use a fan-assisted combustion system and electronic controls to modulate heating output.
Because these boilers are electronically controlled, the circuit board is the central component. When the PCB fails, the boiler may lockout, fail to ignite, or cycle erratically. The micro switch valve controls water diversion between heating and hot water circuits.
How does the control system work?
The Baxi SV 150 240/272 uses a main PCB to sequence ignition, monitor flame presence via the ionization electrode, and control the 3-way valve. The micro switch on the valve confirms water flow direction to the PCB. If the micro switch fails, the boiler may not switch between central heating and domestic hot water.
The ignition electrode creates a high-voltage spark to ignite the gas-air mixture. Over time, electrodes degrade due to thermal stress and contamination, leading to ignition failure. The 2-amp fuse protects the PCB from electrical surges.
Key Specifications for Baxi SV 150 240/272 Parts
| Component | Part Number | Electrical Rating | Function |
|---|---|---|---|
| Main Circuit Board | SX5657840 / JJJ005678220 | 230 VAC, 50 Hz | Boiler sequencing & control |
| Micro Switch Valve | SX5641800 | 24 VDC (typical) | Water flow direction control |
| Ignition Electrode | SX8422580 | High-voltage (spark) | Gas ignition |
| Fuse (2A) | SX9950580 | 2 A, 250 VAC | PCB protection |
According to Baxi Installation & Servicing Instructions for the SV 150 series, 2019: "Before any servicing or replacement of components, isolate the boiler from the electrical mains supply."
Types of Baxi SV 150 240/272 Spare Parts
Spare parts for this series fall into four categories: electronic controls (PCB), hydraulic components (valves), ignition components (electrodes), and protective devices (fuses). Each serves a distinct function in the boiler's operation.
- Electronic Controls: Main PCB (SX5657840) manages all boiler functions. The replacement part JJJ005678220 is the updated equivalent.
- Hydraulic Valves: The 3-way micro switch valve (SX5641800) diverts water flow between radiators and hot water cylinder.
- Ignition Components: The ignition electrode (SX8422580) generates the spark for gas ignition.
- Protective Devices: The 2-amp fuse (SX9950580) protects the PCB from overcurrent.
Selection Criteria for Baxi SV 150 240/272 Parts
- Verify the exact boiler model: Confirm whether you have the 240 or 272 variant. While most parts are shared, always cross-reference the part number against your boiler's serial plate.
- Check the PCB revision: The original SX5657840 has been superseded by JJJ005678220. When ordering, specify the newer part number to ensure compatibility with the latest software.
- Inspect the micro switch valve: The SX5641800 is a 3-way valve with a micro switch. Verify the electrical connector type matches your boiler's harness.
- Confirm electrode gap: The ignition electrode SX8422580 must be gapped correctly (typically 3-4 mm) for reliable ignition. Order the genuine part to ensure correct gap.
- Use the correct fuse rating: Always use a 2-amp, 250 VAC fuse (SX9950580). Using a higher-rated fuse can damage the PCB.
Product Comparison: Baxi SV 150 240/272 Spare Parts
| Component | Part Number | Duty | Key Feature |
|---|---|---|---|
| Baxi Fuse 2AMP SX9950580 (bag of 10) | SX9950580 | Light (protective) | 2 A, 250 VAC, bag of 10 |
| Baxi Ignition Electrode SX8422580 | SX8422580 | Medium (ignition) | High-voltage spark electrode |
| Baxi Micro Switch Valve 3V SX5641800 | SX5641800 | Medium (hydraulic) | 3-way diversion with micro switch |
| Baxi Circuit Board SX5657840 replaced by JJJ005678220 | SX5657840 / JJJ005678220 | Heavy (electronic control) | Main boiler control PCB |
When stepping up the ladder, start with the fuse and electrode for routine maintenance. The micro switch valve is a mid-level repair, while the circuit board is the most critical and expensive component. For International buyers, we recommend stocking the fuse (bag of 10) and the PCB as critical spares.
Why Source Baxi SV 150 240/272 Parts from 3G Electric?
3G Electric has over 35 years of experience supplying industrial and commercial heating components. We stock 6+ products in this category and offer genuine-specification Baxi spare parts with international export documentation. Our technical team can assist with part cross-referencing and compatibility checks.
We supply across 14 industrial departments, including combustion and controls, ensuring you get the right part the first time. For International buyers, we provide export documentation and can advise on voltage/frequency variants (50 Hz vs 60 Hz) where applicable.
Frequently Asked Questions
How do I know if my Baxi SV 150 240/272 needs a new circuit board?
Common symptoms include a lockout error code on the display, failure to ignite, or erratic cycling. If the boiler has power but no response to thermostat commands, the PCB is likely faulty. Test the 2-amp fuse first, as a blown fuse can mimic PCB failure.
Can I use a 60 Hz power supply for these parts?
The Baxi SV 150 240/272 is designed for 230 VAC, 50 Hz systems. Using a 60 Hz supply may cause the fan and pump to run faster, potentially leading to overheating. For International markets with 60 Hz, consult a qualified engineer before installation.
What is the lead time for Baxi parts in International?
Standard lead time is 3-5 business days for in-stock items. For International export, allow 7-14 days depending on the destination and customs clearance. 3G Electric provides tracking and export documentation for all international orders.
Is the JJJ005678220 a direct replacement for SX5657840?
Yes, JJJ005678220 is the manufacturer's updated part number that supersedes SX5657840. It is electrically and mechanically identical, with updated firmware for improved reliability. Always use the newer part number when ordering.
Key Takeaways
- The Baxi SV 150 240/272 requires genuine spare parts for reliable operation, particularly the PCB, micro switch valve, ignition electrode, and fuse.
- Always verify the part number against your boiler's serial plate before ordering.
- The circuit board (SX5657840/JJJ005678220) is the most critical component and should be sourced as a genuine replacement.
- For International buyers, confirm voltage/frequency compatibility (230 VAC, 50 Hz) and plan for export lead times.
- 3G Electric offers genuine-specification parts with technical support and export documentation.
Contact 3G Electric today for a quote on Baxi SV 150 240/272 spare parts. Our technical team can assist with part identification, cross-referencing, and international shipping arrangements.
