Ideal 179855 Primary PCB KM821 I1 – Refurbished | Atlantic / Classic 2 / Exclusive 2 / i Combi

When an Ideal Atlantic, Classic 2, Exclusive 2, or i Combi 2 boiler suffers from persistent lockouts, ignition failure, or a total loss of control, the primary PCB is typically the cause. The Ideal 179855 PCB KM821 I1 Kit (also referenced as KM721 I1) is the main electronic control board for these boilers — managing all operations including ignition, heating control, and safety systems.

This professionally refurbished unit is tested before dispatch and provides a cost-effective alternative to a brand-new board. Available in 24kW, 30kW, and 35kW variants. Condition: Refurbished. Supplied with a 12-month warranty.

Key Features

• Manufacturer Part Number: 179855
• PCB Type: KM821 I1 / KM721 I1
• SKU: PCB-2937-A-BC
• Available in 24kW, 30kW, 35kW variants
• Fits Ideal Atlantic, Classic 2, Exclusive 2, i Combi 2 and Morco models
• Condition: Refurbished | Warranty: 12 Months

Compatible Boiler Models

Ideal Atlantic Combi: 24 (47-349-81), 30 (47-349-82), 35 (47-349-83)

Ideal Classic 2 Combi: 24 (47-349-71), 30 (47-349-72), 35 (47-349-73)

Ideal Exclusive 2 Combi: 24 (47-349-62), 30 (47-349-63), 35 (47-349-64)

Ideal I Combi 2 Series: 24 (47-349-74), 30 (47-349-75), 35 (47-349-76)

Morco / Ideal LPG: Morco GB24 LPG, GB30 LPG (Series 111)

Important Notes

Select your boiler's kW output (24/30/35kW) when ordering. Verify part number matches 179855 before purchase. Must be installed by a Gas Safe registered engineer. All prices inclusive of VAT.