Description
Baxi 7678800 Service PCB Combi & System L4 – Genuine Control Board
The Baxi 7678800 Service PCB Combi System L4 is a genuine manufacturer control board used across a range of modern combi and system boilers. This PCB is the main electronic control unit, responsible for ignition sequencing, flame supervision, pump operation, temperature control, and all boiler safety monitoring.
When a PCB becomes faulty, boilers may suffer from lockouts, no heating or hot water, intermittent faults, or persistent error codes. Replacing the faulty board with the Baxi 7678800 PCB restores reliable operation and ensures the boiler runs safely and efficiently.
This PCB is supplied as a service replacement board and is used across the L4 boiler platform under Baxi, Main, and Potterton branding. Installation and commissioning must always be carried out by a Gas Safe registered engineer, and compatibility should be confirmed using the boiler data badge.
Potterton Promax Ultra Combi ErP
Promax Ultra 24 Combi ErP (DC) – 47-393-54 DC
Promax Ultra 28 Combi ErP (DC) – 47-393-55 DC
Promax Ultra 33 Combi ErP (DC) – 47-393-56 DC
Promax Ultra 40 Combi ErP (DC) – 47-393-57 DC
Baxi / Main System Boilers
System 12kW – 41-592-71
System 15kW – 41-592-72
System 18kW – 41-592-73
System 24kW – 41-592-74
System 28kW – 41-592-75
prices: Must be remembered all prices are inclusive of VAT.
Please note: Before placing your order you must check your part matches the Manufacturer Part Number stated above
BAXI BOILER SPARES
Meanwhile, if you are looking for any Baxi-related products please click the link: Baxi spares
Also, for Diverter valves for Baxi please click the link: Baxi Diverter Valves
You can also check our whole range of PCBs for Baxi please click the link: Baxi PCBs
Here is also the list of Pumps for Baxi please click the link: Baxi Pumps
In case you are looking for Fans for Baxi please click the link: Baxi Fans
MAIN BOILER SPARES
Also, if you are looking for any Main’s-related products please click the link: Main’s spares
Also, for Diverter valves for Potterton please click the link: Main’s Diverter Valves
You can also check our whole range of PCBs for Main’s please click the link: Main’s PCBs
Here is also the list of Pumps for Potterton please click the link: Main’s Pumps
In case you are looking for Fans for Potterton please click the link: Main’s Fans
POTTERTON BOILER SPARES
For Potterton spares, if you are looking for any Potterton-related products please click the link: Potterton spares
Also, for Diverter valves for Potterton please click the link: Potterton Valves
You can also check our whole range of PCBs for Potterton please click the link: Potterton PCBs
Here is also the list of Pumps for Potterton please click the link: Potterton Pumps
In case you are looking for Fans for Potterton please click the link: Potterton Fans
At Heating and catering parts,
We certainly strive to provide the best possible customer experience. Consequently, we understand that sometimes a product may not meet your expectations or requirements. That is why we offer a comprehensive 30-day return policy to ensure your satisfaction. Please read our full Return Policy
We appreciate you buying from our store. Usually, If your order is received by 1:00 p.m. EST (Monday–Friday), we will ship the item the same day. You can count on us to deliver quickly and safely. In other words, we take pride in our prompt and trustworthy service and will do everything we can to ensure the safe arrival of your package.
Please note that weekends are not included in our next-day delivery guarantee. Delivery for orders placed on Fridays (the next day) is on the following Monday. At the same time select the Saturday delivery option at checkout if you’d like your purchases delivered on a weekend day.
In a word thank you for choosing us!







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