Baxi DuoTEC & Platinum 28 PCB 7690350

Product Overview

The Baxi Boiler Printed Circuit Board (Part Number: 7690350) is an electronic control component designed for selected Baxi DuoTEC 28 and Platinum 28 combi boilers, including specific HE A and ErP versions.

Identified as a PCB Kit Combi 28 HE (4 Coil), this component forms part of the boiler's central electronic control system, coordinating and monitoring essential functions in response to signals from the appliance's sensors, thermostats and operating controls.

The printed circuit board (PCB) manages key operating processes, including ignition sequencing, burner control, central heating and domestic hot water operation, while communicating with associated electrical and safety components.

Its electronic circuitry processes operating demands and safety-related signals, allowing the boiler to activate the appropriate components and respond to abnormal operating conditions.

Correct operation is essential for maintaining reliable boiler start-up, consistent heating and hot water performance, and safe, controlled appliance operation.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished printed circuit boards should be professionally inspected and tested to confirm their condition, correct operation and suitability for installation.

Technical Insight & Common Failure Symptoms

The Baxi PCB 7690350 acts as the boiler's main electronic control centre, processing signals from temperature sensors, operating controls and safety devices. It coordinates the operation of connected components, including the fan, ignition system, gas valve and circulation pump, according to the boiler's programmed operating sequence.

Electrical faults, deterioration of electronic components, damaged connections, moisture exposure or problems affecting the board's control circuitry may interfere with normal boiler operation, communication between components or safety monitoring.

Possible symptoms that may indicate a faulty PCB or associated electronic control problem include:

• Boiler failing to start despite receiving a heating or hot water demand.

• Boiler displaying fault codes or entering a safety lockout.

• Intermittent boiler operation or unexpected shutdowns.

• Ignition sequence failing to initiate or complete correctly.

• Central heating or domestic hot water functions failing to operate as expected.

• Fan, pump or other controlled components failing to activate when required.

• Boiler controls becoming unresponsive or operating inconsistently.

• Repeated electrical or control-related faults during operation.

• Visible damage, overheating, corrosion or deterioration affecting the PCB or its electrical connections.

These symptoms do not necessarily confirm a faulty PCB, as similar problems may result from the electrical supply, wiring, sensors, ignition components, fan, pump, gas valve or other connected controls. Correct professional diagnosis should be carried out before replacing the component.

Safety Advice

Boiler printed circuit boards are essential electronic control components within gas-fired heating appliances. Inspection, removal, installation and testing must only be carried out by a suitably qualified heating engineer, with a Gas Safe registered engineer required for work involving gas safety or combustion-related functions.

Always isolate the appliance's electrical supply before carrying out any work and follow the manufacturer's installation and servicing instructions.

Ensure the correct PCB part number, appliance model, serial number and control configuration are verified before installation. Different versions of Baxi DuoTEC and Platinum boilers may require specific PCB configurations.

Handle the printed circuit board carefully to avoid damage from electrostatic discharge, moisture or incorrect electrical connections. Never bypass or modify the boiler's electronic safety controls.

Where required by the manufacturer's instructions, complete the appropriate PCB configuration, electrical safety checks, ignition testing, combustion checks and operational safety verification before returning the boiler to service.

If electrical damage, overheating or unsafe boiler operation is suspected, do not operate the appliance until it has been inspected by a suitably qualified professional.