Craftsman 139.18451D Owner's Manual

Craftsman 139.18451D Owner's Manual

1/2 hp 315 mhz garage door opener
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Owner's Manual
112 HP
315 N
GARAGE
DOOR OPENER
For Residential
Use Only
Models • 139.18451 D • 139.18452D
• 139.18453D
• 139.18473D
Iqi
Z
G3
m
00
Read and follow
all safety rules
and operating
instructions
before
first use of this product.
Fasten the manual near the garage
door after installation.
Periodic checks of the opener are
required to ensure safe operation.
• Safety Precautions
• Assembly
• Installation
• Adjustment
• Maintenance
• Operation
• Troubleshooting
• Parts List
Sears Canada,
Inc., Toronto,
Ontario M5B 2B8

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Questions and answers

Mike
February 23, 2025

Motor just hums

1 comments:
Mr. Anderson
February 23, 2025

The Craftsman motor with part number 139.18451D hums but does not operate due to one of the following reasons:

1. RPM Sensor Failure – If the motor unit hums briefly and moves only 6-8 inches (15-20 cm), the RPM sensor may be faulty. Try resetting the unit by unplugging it. If the issue persists and the unit still flashes 5 times, replace the RPM sensor.

2. Motor Overheating – If the motor does not move at all, it may be overheated. Unplug the unit, wait 30 minutes, then retry.

3. Logic Board Failure – If the motor still does not operate after cooling down and resetting, the logic board may need to be replaced. The manual suggests that motor failures are rare, so replacing the logic board is recommended.

This answer is automatically generated

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139.18452d139.18453d139.18473d

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