Potterton Promax Ultra PCB – Refurbished | Part Nos. 720878201 / 720878202

Electronic faults, boiler lockout, ignition failures, or heating errors in a Potterton Promax Ultra 24, 28, 33, or 40 Combi ERP boiler are commonly caused by a failed printed circuit board. The PCB is the central control unit — managing ignition sequences, heating cycles, temperature regulation, and all safety functions. The Potterton Promax Ultra PCB (Part Nos. 720878201 / 720878202) is a professionally refurbished direct replacement covering the full Promax Ultra Combi ERP range in both AC and BC/CC serial number variants, restoring reliable electronic control and safe boiler operation.

This refurbished unit has been cleaned, inspected, and tested by our engineering team before dispatch. All critical PCB functions are verified to be operating correctly. Supplied with a full 12-month warranty.

Compatible Boiler Models

Note on Serial Numbers: Part No. 720878201 applies to serial suffix AC units; 720878202 applies to BC and CC serial suffix units. Always check your boiler's data plate to confirm the correct part number before ordering.

Quality-Checked. 12-Month Warranty. Same-Day Dispatch.

Every refurbished Potterton PCB is tested end-to-end by our engineering team before dispatch. Supplied with a full 12-month warranty. Orders placed before 1:00 PM (Mon–Fri) are dispatched the same working day. Returns accepted within 30 days in original unused condition.

Note: Installation must be carried out by a Gas Safe registered engineer. Please confirm part numbers 720878201 / 720878202 and your boiler's serial suffix match before ordering.