Ideal Printed Circuit Board Kit Cui I7/2 Prefix AAO 176831

The Ideal 176831 is a printed circuit board kit for the Cui I7/2 control board used across a number of Ideal combi appliances. The board is the main control PCB, handling ignition sequencing, fan and pump control, temperature regulation and fault monitoring for the boiler. This kit is specified for appliances carrying the prefix AAO onwards, so the board revision matches the wiring and software expectations of that build.

• The boiler locks out repeatedly with no obvious mechanical cause, and resetting only gives a short period of running.
• No display, blank screen or missing indicator LEDs on the control panel.
• The fan, pump or diverter does not run when a demand is present, despite the boiler receiving power.
• Fault codes appear that point to control or communication errors rather than a sensor or gas-side problem.
• Heating or hot water behaves erratically, with the boiler firing and shutting down without a consistent pattern.

• Check the appliance data badge and confirm the model and GC number against the compatibility list, as the same appliance family can use more than one board revision.
• Confirm the appliance prefix is AAO or later, since this kit is specified for that build range.
• Note the alternative part number 1782046 when cross-referencing an existing board or an engineer's notes.
• Work on the boiler casing and controls should be carried out by a competent person; isolate the electrical supply before removing or refitting the board.