Have HVAC Questions? Ask an HVAC Expert for Answers
hi i am dan i can help you with this. what terminal connections do you have on the new thermostat?
ok did you wire the terminals the same as the old thermostat?
ok the new thermostat should be wired the same except white is going to go to aux brown will go to C and blue is not used.
the blue wire went to L on the old thermostat. that is just for a light on the thermostat. the brown X is your common. the air can not be hot and cold it is either hot or cold. are the pipes coming from the outdoor unit hot or cold? also what is the brand of unit you have?
ok that means the outdoor unit is in heating mode. that means it is a problem with the O and B wire. depending on the brand of your system depends on what setting you use. most systems use the O terminal. make sure your thermostat is set to use O on cooling changeover
if you connect the orange wire to R then the outdoor unit will only cool
by setting the thermostat correctly. in the parameter settings of the thermostat there will be a setting for using the O terminal or B terminal. or cooling changeover, heating changeover. also make sure the thermostat is set for a heat pump system in the parameter settings
it may have gone to the transformer and had a switch or relay in it too. all the l terminal does its power a light on the thermostat when the unit has a malfunction. that feature is not supported by modern systems and is not needed