LiftMaster K073A0003 Line Filter
The LiftMaster K073A0003 is a line filter replacement kit used with various LiftMaster barrier gate and slide gate operator models. A line filter helps manage electrical noise and line interference in compatible operator circuits, supporting stable operation where the original filter is damaged or has failed. This part is not a universal surge protector and should not be installed as a guess for unrelated electrical problems. Match the part number from the operator parts diagram before ordering, especially because LiftMaster has several different filter boards and electrical service parts across gate operator generations.
This product page is written for buyers replacing a known LiftMaster part number, not for guessing from appearance alone. Many LiftMaster gate operator parts look similar across generations, so the safest ordering method is to match the part number from the original component, the operator parts diagram, or the model-specific service manual.
Compatible With
- Various LiftMaster barrier gate operator models when the parts diagram calls for K073A0003
- Various LiftMaster slide gate operator models when the parts diagram calls for K073A0003
- Select LiftMaster gate opener systems that specify line filter K073A0003
- Select Mega Arm / Mega Sprint style barrier applications may reference line-filter service parts - verify by manual and part number
- Not a substitute for different LiftMaster EMI filter boards or power boards unless the manual specifically cross-references it
Also Known As / Related Part Numbers
- K073A0003
- 073A0003
- 73A3
- LIF-K073A0003
- LiftMaster Line Filter
- Line Filter Replacement Kit
- Related but different part type: K1D7078 EMI filter board - do not substitute without verification
Features and Specifications
| Manufacturer | LiftMaster |
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| Part Number | K073A0003 |
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| Product Type | Line filter replacement kit |
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| Application | Select LiftMaster barrier gate and slide gate operators |
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| Also Known As | 73A3, 073A0003 |
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| Important Note | Verify exact electrical part in the model-specific parts diagram |
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Technician Notes
- Electrical symptoms can come from power supply, grounding, wiring, board, or accessory issues, not only from the line filter.
- Do not confuse this line filter with other LiftMaster EMI boards or power-control boards.
- If the original filter failed from surge, water, or heat damage, inspect the surrounding wiring and control area before replacing only this part.
Before Ordering Checklist
- Confirm the model-specific parts diagram calls for K073A0003, 073A0003, or 73A3.
- Verify the operator type is a compatible LiftMaster barrier or slide gate model.
- Inspect surrounding wiring, connectors, and cabinet condition.
- Correct water intrusion, insect damage, surge damage, or grounding problems before installing a new filter.
- Have high-voltage electrical issues diagnosed by a qualified technician.
Professional Advisory
Line-voltage electrical components should be serviced only by a qualified technician. Disconnect power before service and do not bypass grounding, fusing, safety circuits, or factory electrical protection devices.
Product Questions and Answers
What does the K073A0003 line filter do?
It is a replacement line filter used in select LiftMaster barrier and slide gate operator electrical systems to help manage line noise and interference.
Is K073A0003 the same as 73A3?
Yes, 73A3 and 073A0003 are commonly listed as related references for K073A0003.
Can I use this instead of another LiftMaster filter board?
Do not substitute it for a different EMI filter board, power board, or control board unless the operator manual specifically confirms the cross-reference.
