# What is a Vaillant cooling resistor?

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

Defines the Vaillant cooling resistor (code plug) — the coding component that authorises a Vaillant aroTHERM or VWL heat pump to run in cooling mode.

The Vaillant cooling resistor (code plug, part 0020266328 / 0020269259) authorises a
Vaillant aroTHERM or VWL heat pump to run in cooling mode.

- Without it, the heat pump runs heating and hot water only.
- It authorises cooling; it does not switch cooling on by itself.
- An installer must still enable cooling in the installer menu.
- Price: GBP 47.50. Condition: new, genuine OEM, factory packaging.

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