Zeker

Hello...we have a two Zone Duo-Therm Comfort Control Center ( 5 years old). No problems until now..went to switch to Zone 2 and it only showed limited functionality so reset the controller (turned off, pressed and held Mode & Zone, turned on, released Mode & Zone, FF displayed which is supposed to indicate has been reset...have used this reset before with no problems). After this reset Zone 2 does not show up at all now. Any further suggestions before I call the Duo-Therm service center? Thanks.