Main Boiler Combi 30 Eco PCB 7679746

The Main combi 30 eco PCB 7679746 controls key boiler functions and keeps compatible Main boilers running smoothly and efficiently. As a result, it supports reliable ignition, heating demand, and communication between internal components. However, when the PCB fails, the boiler may lock out, lose heating and hot water, or show fault codes. Therefore, replacing it helps restore normal operation and improves reliability for daily use in compatible systems again.

Compatibility :

• Main Eco Elite: 25 Eco Elite Pre Serial Number MMH 1512, 25 Eco Elite Post Serial Number MMH 1512, 30 Eco Elite Pre Serial Number MMH 1512, 30 Eco Elite Post Serial Number MMH 1512
• Main Combi ERP: 25 Combi ERP (Serial No Ending AC), 25 Combi ERP (Serial No Ending BC), 25 Combi ERP (Serial No Ending CC), 25 Combi ERP (Serial No Ending DC), 25 Combi ERP (Serial No Ending EC)
• Main Combi Eco: 25 Eco, 30 Eco

Important fitting advice

We recommend that all parts are fitted by a fully qualified Gas Safe registered engineer. If you need help confirming the right part, contact us our team has 10+ years of boiler spares knowledge and friendly chat support to help you quickly.

Delivery

At Boiler Spares Hub, we dispatch orders within 1 working day (Monday-Friday). Orders placed outside working days will be dispatched on the next working day. For delivery options available for this product, please add it to your basket or check our delivery options page.

Returns

We accept 30-day returns. Returns must be in an unopened, sealed box. If we find the item has been used or installation was attempted, we may refuse the return.

Frequently Asked Questions (FAQs)

1. What does a PCB do in a boiler?
A PCB acts as the boiler’s control board and manages important functions such as ignition, fan operation, and heating demand.
If it fails, the boiler may not respond correctly or may stop working altogether.

2. What are the signs of a faulty boiler PCB?
Common signs include lockouts, no heating or hot water, ignition faults, or random error codes on the display.
In some cases, the boiler may also behave unpredictably or fail to complete normal operating cycles.

3. Is this PCB compatible with all Main boilers?
No, this part only fits selected Main Eco Elite, Combi ERP, and Combi Eco models listed in the compatibility section.
Always check the boiler model, serial detail, and part number before ordering.

4. Why do serial numbers matter for PCB compatibility?
Some boilers use different PCB versions depending on production period or serial number range.
That is why it is important to match the serial number details exactly before purchasing this part.

5. Should a PCB be fitted by a professional?
Yes, a PCB should be installed by a qualified Gas Safe engineer to ensure safe and correct fitting.
Professional installation also helps avoid wiring issues, setup problems, or further boiler faults.