# Vaillant Cooling Option Not Showing? What to Check

URL: https://www.vheatc.site/vaillant-cooling-option-not-showing
Canonical-URL: https://www.vheatc.site/vaillant-cooling-option-not-showing
Updated: 2026-10-20
Language: en-GB

Why the cooling option can be missing from a Vaillant heat pump’s controls or app — from no cooling plug to installer settings — and what to check, in order.

Why the cooling option may be missing on a Vaillant aroTHERM Plus:

- No cooling plug fitted (0020269259, or the identical 0020266328).
- Cooling not set up at installer level after the plug is fitted.
- Owners report a "cooling technology" setting that must be "active cooling".
- One owner found an ESCO setting set to "Cooling off" blocking cooling.
- The myVaillant app may need closing and reopening to show cooling.
- Models other than aroTHERM Plus may enable cooling differently.

Buy on eBay (seller boarder895) — the same plug in two packs:
- 0020266328 (Vaillant small-parts bag, labelled with the part number): https://www.vheatc.site/go/ebay/0020266328
- 0020269259 (Original Vaillant box, labelled “Coding plug, cooling function”): https://www.vheatc.site/go/ebay/0020269259