# How a Vaillant cooling resistor is fitted

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Updated: 2026-05-22
Language: en-GB

An overview of how the Vaillant cooling resistor is fitted into a heat pump’s wiring — an installer task, explained for owners.

A Vaillant cooling resistor is fitted by an installer into a defined
coding-plug position in the heat pump wiring.

- The controller reads the resistance and recognises cooling is permitted.
- The exact position varies by model; fitting follows the installer manual.
- Fitting authorises cooling; it does not switch cooling on.
- An installer must then enable cooling in the menu and commission it.
- Parts 0020266328 and 0020269259 are identical and fit the same way.
- This is a competent-installer job — use a Vaillant-approved installer.
- Resistor price: GBP 47.50. Genuine OEM, factory packaging.

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