A001_F: No Model Data
Status
This is a critical alarm, the furnace will not operate in any mode.
Description
This code is displayed anytime there is no model data at the furnace. The model data is electronically stored data that is used to define (among other things) blower operation. Without model data, the furnace cannot function. Note that the model data may be available to the furnace even if there is no card attached to the furnace control (IFC). A missing model data card will display a d4 if the model data is available on the network.
Expected Operation
No operation, including the thermostat will be permitted without the model data. The model data defines the IBM (Indoor Blower Motor) speed-torque curve. Without this information, the IBM cannot operate.
Cause
Typically the memory card will be missing from the furnace or was not installed in the replacement IFC. When the IFC is replaced, the memory card must be saved and installed in the replacement control.
Solution
Replace the missing memory card into the memory card socket. If the memory card cannot be found, a replacement may be ordered from your distributor. Be sure to provide complete model and serial number so that the correct memory card can be ordered. Note: Furnace power must be cycled off, the card installed and then restore power or the model data card cannot be read.
