Manual for VAI 6-025 WN

Manual for VAI 6-025 WN

Brand: Vaillant

Category: Thermostat

Document Type: Manual

Language: EN

Available Languages: EN , ES

Uploaded: April 20, 2026, 8:03 p.m.

Manual Publish Date: 2014-06-01

Warranty Information

Refer to the installation manual or contact your supplier for warranty details.

Operating Instructions

1. Getting Started

Fitting Remote Control Batteries: Insert two AAA batteries into the remote control, ensuring correct polarity. Then press ON/OFF to test.

Clock Settings: Press CLOCK, the hour indicator flashes. Use +/- buttons to set the time (minute increments). Press CLOCK again to confirm.

2. Operating Instructions

Switching On/Off: Press the ON/OFF button on the remote control.

Operation Modes: Press MODE to cycle through AUTO, COOL, DRY, FAN ONLY, and HEAT. Use TEMP/+/- to set temperature. FAN button adjusts fan speed.

  • AUTO: Unit automatically selects COOL or HEAT based on ambient temperature.
  • COOL: For cooling only. Direct louvers horizontally.
  • DRY: Reduces humidity. Low fan speed.
  • FAN ONLY: Circulates air.
  • HEAT: For heating only.

Special Functions: SLEEP (nighttime comfort), TIMER ON/OFF (program start/stop times), TURBO (fast cooling/heating), X-FAN (removes humidity after shutdown in COOL/DRY mode), TEMP (displays temperatures), Emergency Operation (manual control if remote is lost/broken).

3. Advice for saving energy

Maintain suitable room temperatures, eliminate heat/cold sources, use heat pump efficiently, uniform heating, utilize SLEEP and TIMER functions, and perform regular maintenance.

4. Maintenance

Regular cleaning of the remote controller, indoor unit, air filters, and outdoor unit is essential. Disconnect power before cleaning. Ensure filters are dry before reinstallation.

Troubleshooting and error codes

SYMPTOMS POSSIBLE CAUSES POSSIBLE SOLUTION
The system does not restart immediately The unit needs 3 minutes to protect the system after stopping. Wait 3 minutes before starting the unit again.
The system does not work at all (the ventilation does not start) Power lead not connected correctly. Power supply cut. Fuse blown. Connect the power lead correctly. Reconnect the power supply. Replace the fuse with the correct type.
Insufficient cooling or heating Doors/windows open. Heat source nearby. Thermostat setting incorrect. Obstacle in air inlet/outlet. Ambient temperature not reached. Dirty air filter. Direct sunlight during cooling. Close doors/windows. Remove heat source. Set thermostat correctly. Remove obstacle. Wait. Clean air filter. Use a curtain.
Noise is heard Gurgling noise (normal first few minutes). Cracking noise (normal expansion/contraction). Loud noise from louvers. Normal operation. Normal operation. Clean air filters.
Smells are generated Circulation of indoor smells (furniture, cigarettes). No action required.
Mist or steam is blown out from the unit Sudden cooling of indoor air in COOL or DRY mode. No action required.
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