The LiftMaster 041C4398A RPM Sensor Kit is a replacement sensor assembly used on select residential garage door openers to monitor motor rotation. It is also commonly referenced as 41C4398A and is used across several LiftMaster, Chamberlain, and Craftsman opener platforms.
What This Part Does
The RPM sensor reads motor movement and sends feedback to the opener control board. If the board cannot detect proper RPM feedback, the opener may stop, reverse, or fail to complete a travel cycle even when the motor and door appear functional.
Compatible With
The 041C4398A is commonly used on select AC chain drive and belt drive garage door openers. Compatibility depends on opener model, motor style, and logic board generation.
Common Compatible Models
- LiftMaster 1345 AC chain drive models
- LiftMaster 1346 dual sprocket AC chain drive models
- LiftMaster 3265 AC chain drive models
- LiftMaster 3280 AC belt drive models
- Select LiftMaster 3255 and Formula I models when confirmed by parts diagram
- Select Chamberlain 1345, 1346, 1355, PD210, and PD212 models when confirmed by parts diagram
Related Model Families
- Select LiftMaster, Chamberlain, and Craftsman residential openers manufactured after the mid-to-late 1990s
- Select openers using compatible RPM sensor board numbers and motor feedback wiring
- Not for every DC motor or screw drive operator
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain |
| Product Type | RPM Sensor Kit |
| Part Number | 041C4398A |
| Related Numbers | 41C4398A, 41C4398, 41C4398-1 |
| Application | Motor RPM feedback sensor replacement |
| Compatible Operator Type | Select AC chain drive and belt drive residential garage door openers |
| Common Related Numbers | 1A4903, 41C3005, K75-16426, 41B3000 |
| Notes | Verify motor type, wiring connector, and opener parts diagram before ordering. |
Also Known As / Related Part Numbers
This item may be searched under several related LiftMaster, Chamberlain, or Craftsman part number formats. Related numbers should be matched against the original part and the opener parts diagram before ordering.
- 041C4398A
- 41C4398A
- 41C4398
- 41C4398-1
- 1A4903
- 41C3005
- K75-16426
- 41B3000
- RPM sensor board
- Motor speed sensor kit
Technician Note
RPM sensor symptoms can look like logic board, travel, force, or motor problems. Before replacing the sensor, check the door balance, travel limits, wiring connector, motor shaft area, and diagnostic flashes. If the sensor wheel or wiring is damaged, the board may not receive reliable movement feedback.
Before Ordering, Confirm
- The opener parts diagram lists 041C4398A or a related RPM sensor number.
- The opener is a compatible AC chain or belt drive model.
- The sensor connector and mounting style match the original part.
- The door is balanced and not binding.
- Diagnostic symptoms point toward RPM feedback rather than a failed logic board or motor.
Professional Advisory
Disconnect power before accessing the motor and sensor area. After replacement, test a complete open and close cycle with the door in view and confirm safety reversal operation.
Important Ordering Warnings
- Not for every LiftMaster or Chamberlain opener.
- Not a cure for a binding door, worn gear set, or failed motor.
- DC motor and screw drive systems may use different sensing parts.
- A damaged logic board can mimic RPM sensor failure.
Questions & Answers
What does the 41C4398A RPM sensor do?
It monitors motor rotation and sends movement feedback to the opener control board during operation.
What symptoms can a bad RPM sensor cause?
A failed sensor can cause short travel, stopping, reversing, clicking, diagnostic flashes, or failure to recognize motor movement.
Which openers commonly use this sensor?
It is commonly associated with select LiftMaster 1345, 1346, 3265, and 3280 models, plus related Chamberlain and Craftsman AC opener platforms when confirmed by parts diagram.
Is this part the same as a logic board?
No. The RPM sensor is separate from the logic board, although either part can cause similar movement-related symptoms.
What should I check before replacing it?
Check the original sensor number, connector style, door balance, motor operation, sensor wheel, and diagnostic codes.
