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The dampers do not open, the system always displays STOP
The dampers do not open, the system always displays STOP
First check whether the thermostat allows you to access the change mode screen. If not, locate the installation's master thermostat ( Which is my installation's master thermostat?  ).

If you are indeed accessing from the master thermostat and the problem is that it selects a mode other than STOP and the system automatically reverts back to STOP, the problem could be in the main control board. Check whether there is a bridge at connector J14 (ALAR) in the main control board and that it is actually being short-circuited (check with a multimeter). If is not, short circuit the two poles of connector J14.