Installation and Operation Manual
22
ECM Evaporator Fan
Product Overview
This troubleshooting guide covers the evaporator fan. The fan is supplied as a complete assembly (fan blade, motor
mount and power harness) with no replaceable components. An electronically commutated (brush-less) motor powers
the fan.
The following problems are addressed:
• motor is not spinning at the correct speed
• motor is not spinning
• motor sounds noisy
Procedures—Fan mounted in the case
Motor is not spinning at the correct speed
•
Disconnect fan power. Use the handheld speed programmer P/N HX0C-003-000-01 and the instructions in
the accompanying operating manual to confirm that the fan speed setting is correct for the case model. If
the setting is incorrect, reprogram the fan as needed, disconnect the programmer and reconnect fan power.
If the setting is correct, continue with troubleshooting.
Motor is not spinning
•
Perform a hard reset of the electronics by removing power to the fan for at least 10 seconds.
•
Check that the fan blades are completely free of obstruction by manually spinning the fan blade.
•
If any obstruction is found, remove it and inspect the fan blades for damage.
•
Replace any fan with bent or gouged blades. Small nicks in the blades are acceptable.
•
Check that the correct power is being applied at the case side of the fan harness and that the harness is
firmly connected to the power line.
•
Reapply fan power and check if the problem has been resolved.
NOTE: If the above actions do not solve the problem, disconnect power to the fan and remove the fan from the case
along with its harness.
MOTOR MOUNT
FAN BLADE
PROGRAMMING PORT
FAN SIDE HARNESS
POWER HARNESS
CASE SIDE HARNESS