Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler VU 446/5-5 symbols
8 symbols on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler VU 446/5-5 explained, 8 taken from its own manual: burner anti-cycling, burner on, domestic hot water, fault and 4 more.
What each symbol means
What does the Burner anti-cycling symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
The burner is waiting before it may light again. This pause avoids switching on and off too often and lengthens the boiler's life; no action is needed.
From this model's manual
What does the Burner on symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
Shown on the boiler display while the burner is lit and working correctly.
From this model's manual
What does the Domestic hot water symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
Hot water production is active. Steady: hot water is being drawn but the burner is not yet lit. Flashing: the burner is on to heat the hot water.
From this model's manual
What does the Fault symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
Replaces the normal display when the boiler has a fault, together with a fault code (F. and a number) and sometimes a plain-text message. If the fault cannot be cleared, contact a competent heating engineer; after an ignition fault (F.28 or F.29) check the gas valve is open and press reset, at most three times.
From this model's manual
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.
From this model's manual
What does the Heating system filling pressure symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
Shows the current water pressure in the heating system; the dotted lines mark the permitted range. Steady: pressure is within range. Flashing: pressure is outside the range. Recommended filling pressure is 1.5–2.5 bar; below 0.5 bar the boiler switches off and shows fault F.22. If the pressure is too low, top up the heating system.
From this model's manual
What does the Maintenance required symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
The boiler needs maintenance work but is not in fault and keeps running normally. Contact a competent heating engineer. If the water pressure is flashing at the same time, top up the heating water. Details of the message are in the boiler's status display (Live Monitor).
From this model's manual
What does the Summer mode symbol mean on the Vaillant ecoTEC plus VU 446/5-5 and VU 606/5-5 boiler (VU 446/5-5)?
Heating is switched off while hot water production stays available. Appears after the heating flow temperature is set to Heating off.
From this model's manual
Meanings marked “brand-wide” or “general” are not stated in this model's manual; check your own manual when in doubt.