What does the Heating mode symbol look like?

Pixel-style radiator: four vertical columns joined by top and bottom rails with short feet. It is also called “central heating”, “heating”, “heating mode” and “radiator”.

Which products show the Heating mode symbol?

It is recorded on Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5).

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Heating & air conditioning

Heating mode

Pixel-style radiator: four vertical columns joined by top and bottom rails with short feet. · also called “central heating”, “heating”, “heating mode”, “radiator”

What it means on vaillant

Heating mode active

Central heating is active. Steady: there is a heat demand from the heating. Flashing: the burner is on for the heating.

Source · Manufacturer manual Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler operating instructions · checked Nov 11, 2026

Where it appears

Heating & air conditioning

Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler
VU 446/5-5This meaningChart

Questions about the Heating mode symbol

What does the Heating mode symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?: Central heating is active. Steady: there is a heat demand from the heating. Flashing: the burner is on for the heating.
What does the Heating mode symbol look like?: Pixel-style radiator: four vertical columns joined by top and bottom rails with short feet. It is also called “central heating”, “heating”, “heating mode” and “radiator”.
Which products show the Heating mode symbol?: It is recorded on Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5).

Checked against the source · Nov 11, 2026 · How we verify

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