The Malfunction light on the thermostat is blinking. When I first noted this, the airhandler was running, but am unsure if the heatpump was working (a 12 yr old Trane XL 1200). The hp now just makes a clicking sound.
Of course, I am hoping this is something simple, (possibly related to the Tstat?) that I might repair. Of course, given the age of the unit this may just be wishful thinking. Any ideas on a possible cause/solution?
Thank you.