A068_F: No Blower Communications
Status
This is a critical fault. The furnace will not operate in any mode.
Description
The furnace control (I.F.C.) can not communicate with the blower motor.
Expected Operation
If the furnace was in heating operation when this fault occurred, the gas valve will immediately close(flame will be lost), IBM (Indoor Blower Motor) operation will immediately stop and the furnace will shut down normally (except without IBM operation) with IDM (Induced Draft Motor) post-purge at the correct speed. After the post purge (or immediately if no heat call was present), no other operation (including thermostat calls) will occur until this fault is cleared.
Cause
1. The wires between the blower motor have been disconnected or there is a poor connection.
2. There is no line voltage to the motor.
3. The furnace model data is faulty or corrupted.
4. The motor has failed catastrophically.
Solution
1. Check wiring, connectors and terminals - repair or replace as necessary.
2. Check line voltage wiring, connectors and terminals to the Power Factor Correction choke and ECM motor. Repair and replace as necessary.
3. Replace the furnace memory card with the correct replacement part from your distributor.
4. Replace mid pressure switch.
5. Replace the motor.
