Velleman VMB1TSW - Manual (Page 14)

Cooling or heating mode
When the temperature sensor is configured to control an air-conditioning system, the frost flower LED (upper LED)
will be lit. Setting the heating or cooling mode can only be done through a temperature controller (VMB1TC /
VMB1TCW) or through the Velbus link program.
Heating mode Cooling mode
Air-conditioner or heater active
When the heater (valve open) or air-conditioner is active, a red LED will be lit.
The red output LED can indicate following error conditions:
 Flashing (short on, long off): the heater/cooler should be off but it did not
receive the command from the relays module.
 Flashing (short off, long on): the heater/cooler should be on but it did not
receive the command from the relays module.
 Fast flashing: configuration of the sensor chip failed.
Note: as long as the error condition exists the output status wil be re-
transmitted every minute.