What does 15011 mean?

A thermistor that monitors common water temperature in a master/slave setup has failed. Master/slave operation will be disabled, and the unit will operate in stand-alone mode.

• Defective common water thermistor
• Wiring fault in the master/slave configuration

Click steps to track your progress.

1. 1

   Inspect the wiring to the common water thermistor in the master/slave setup.

2. 2

   Check the thermistor for any damage.

3. 3

   Contact Carrier Service if the unit remains in stand-alone mode.