Originally Posted by
roopi
Anyone have any tips if I can repair this myself or do I need to call someone?
One of my Honeywell Thermostats started displaying error codes 53 and 89 and the red light turned on (I believe this light refers to an outdoor unit / AC). I do have an A/C unit (York YCJD series) connected to the thermostat.
Since the error started the furnace/heat won't shut off.
Error 53 - Indicates failing outdoor sensor.
Error 89 - Indicates cooling/heating unit missing.
I'm assuming 89 is displayed because the sensor failed. Now my questions is where would this sensor be? Or do I just hire someone? Also if anyone does this or has recommendations on someone to call let me know.