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Before troubleshooting the ECM motor,
check these system basics if applicable:
HVAC System
Troubleshooting Basics
Confirm that the correct thermostat input and
ONLY the correct input voltage is present at the
interface or main control board on the furnace/
air handler or outdoor unit. Loose or broken low-
voltage wires are also potential problem areas and
can cause intermittent problems.
For the heating and/or cooling systems, use the
manufacturers guide to confirm proper demands
(heat or cool), especially on multi-stage systems.
Use the “Sequence of Operation” charts and the
“Thermostat Wiring Diagrams,” found in these
guides to confirm proper wiring and operation.
When checking low-voltage connections, always
use the C terminal on the board,never ground.
Check the setting of the jumper pins or switches
or menu selections on the manufacturer’s control
board or system interface. Do not assume they
are correct; use the manufacturer’s guide to select
the proper airflow, delays, and profiles.
Always
disconnect the main power to the unit when
making these adjustments, unless required for
interface operation.
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