Main Eco Compact Combi/System PCB – Refurbished | Part No. 7688421

Loss of heating or hot water, ignition failure, or erratic control panel behaviour on a Main Eco Compact boiler typically points to a faulty PCB. The Main Eco Compact Combi/System PCB (Part No. 7688421) is the direct refurbished replacement, restoring full electronic control of ignition, heating, and hot water management across the Eco Compact 15 System, 18 System, 25 Combi, and 30 Combi ranges.

This refurbished unit is taken from a fully functioning boiler and quality-checked by our experienced engineering team to the highest standard before dispatch. Minor cosmetic marks may be present, but all functional performance is confirmed. Supplied with a full 12-month warranty.

Compatible Boiler Models

Part Identification

• Manufacturer: Main
• Part Number: 7688421
• Part Type: PCB (Main Control Board)
• Compatible Types: Combi and System

Quality-Checked. Reliable. 12-Month Warranty.

Every refurbished Main PCB we supply is quality-checked to the highest standard by our experienced engineering team before dispatch, confirming correct ignition sequencing, heating and hot water control, and safety shutdown performance. Backed by a full 12-month warranty.

Delivery & Returns

Orders placed before 3:00 PM (Mon–Fri) are dispatched the same working day. Standard and next-day delivery available at checkout, including Saturday delivery for an additional charge. Returns accepted within 30 days in original unused condition.

Note: Please confirm that part number 7688421 matches your existing PCB and check your boiler's GC number and type (Combi/System) before ordering. Installation must be carried out by a Gas Safe registered engineer.