Does the Vaillant aroTHERM Plus Have a Cooling Mode as Standard?

The short answer

Not out of the box. The hardware to cool is built in, and Vaillant positions the aroTHERM Plus as a cooling-capable platform, but cooling has to be deliberately enabled.

On an aroTHERM Plus supplied without cooling, two things stand between the installed unit and working cooling: the cooling coding plug must be fitted, and a competent installer must enable cooling in the unit’s settings.

Capable is not the same as active

The aroTHERM Plus is a reversible platform. It can run its refrigerant cycle in reverse to remove heat from your home — the compressor, the reversing valve and the cooling control logic are all already inside the unit.

Units supplied for heating and hot water only treat cooling as a deliberately enabled option, so it is only ever commissioned on purpose by a competent installer. That is why the unit can be fully cooling-capable and yet not cool a single degree until it is set up.

What it takes to enable cooling

First, the cooling coding plug is fitted — Vaillant 0020269259, boxed and labelled “Coding plug, cooling function”, or the identical 0020266328. Without it, a unit supplied without cooling will not offer cooling in the installer menu.

Second, a Vaillant-approved installer enables the cooling function in the settings and commissions it. Third, the system needs cooling-suitable emitters — fan coil units, or underfloor with dew-point control — because cooling will not work well through ordinary radiators.

Frequently asked questions