Ideal 175939 Primary PCB Kit

The Ideal 175939 is a primary printed circuit board kit intended for Ideal Combi Plus appliances. The primary PCB is the main control board inside the unit, handling ignition sequencing, temperature regulation, fan and pump control, and the safety interlocks that keep the appliance operating within its design limits. It is supplied as a kit by Ideal Spares and is the board an engineer would replace when the existing primary control board has failed.

• The appliance does not fire or run through its ignition sequence when there is a demand for heat or hot water.
• The display is blank, scrambled, or shows fault codes that clear only when the board is disturbed.
• The boiler locks out repeatedly with no obvious external cause such as gas, water or flue issues.
• The fan, pump or diverter does not respond to demand even though the components themselves test correctly.
• Heating and hot water behave erratically, with temperature swings or intermittent shutdowns that trace back to the control board.

• Confirm the part number on the existing board matches 175939, as board revisions can differ between production runs.
• Check the appliance model and GC number on the data badge against the manufacturer's documentation for the Combi Plus range.
• Isolate the electrical supply and follow anti-static precautions when handling and fitting a printed circuit board.