The Baxi 7809940 is a genuine OEM high-limit thermostat complete with fixing screws, designed for use in Baxi Combi Instant, Duo-tec, and Platinum Combi boilers. This safety-critical component monitors the boiler’s temperature and cuts off operation if overheating occurs, protecting internal parts and preventing unsafe operating conditions.

A faulty high-limit thermostat can lead to boiler lockouts, overheating issues, fluctuating temperatures, or complete shutdown. Replacing it with this genuine Baxi part restores correct thermal protection and safe boiler performance.

Key Features:

• Genuine Baxi high-limit thermostat

• Includes fixing screws for straightforward installation

• Provides essential overheating protection

• Designed for Combi Instant, Duo-tec & Platinum Combi boilers

• Helps resolve overheat lockouts, shutdowns & temperature faults

• Built to strict OEM safety and reliability standards

• Direct-fit replacement for fast professional fitting

Compatibility

The Baxi 7809940 Thermostat Limit is compatible with:

• Baxi Combi Instant

• Baxi Duo-tec Combi

• Baxi Platinum Combi

• Additional Baxi Group boilers listing 7809940 in the official parts manual

Typical compatible outputs include:

• 24 kW

• 28 kW

• 33 kW

Also cross-compatible with selected:

• Main Eco / Eco Elite

• Potterton Promax Combi

Installers should always confirm compatibility using the boiler’s service manual or parts guide.