Marantec 88573, Relay Power Board Kit - M4500E / M4500EL / M4700E / M4700EL / M4900E
The Marantec 88573 relay power board kit is a key electronic replacement part for select Marantec M-Line EOS openers. While the logic board handles control decisions, the power board handles the relay and power switching functions that allow the opener to drive the motor and respond correctly under load. A technician may check this board when an M4500E, M4500EL, M4700E, M4700EL, or supported M4900E opener shows power switching problems, relay clicking without proper movement, visible board damage, or intermittent operation not caused by the door or safety circuit. Correct identification matters because Marantec used different boards across M-Line, Synergy, RV, and LC families. This part should be ordered by the 88573 part number and the operator parts diagram, not by board size alone.
Compatible With
- Marantec M4500E garage door openers
- Marantec M4500EL garage door openers
- Marantec M4700E garage door openers
- Marantec M4700EL garage door openers
- Marantec M4900E references where the parts diagram lists 88573
- M-Line EOS operator repair applications using the 88573 relay power board
- Not a 97798 logic board replacement
- Not for Synergy LC, Synergy 200/300, RV 8000, LC 1000, or Mac-Lift operators unless documented by Marantec
Features and Specifications
| Manufacturer | Marantec |
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| Product Type | Relay power board kit |
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| Part Number | 88573 |
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| Application | Power/relay board replacement for select M-Line EOS openers |
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| Compatible Operator Type | Marantec M4500E / M4700E family and supported M4900E references |
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| Notes | Works with the matching logic board, motor assembly, and harnesses in compatible operators |
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Also Known As / Related Part Numbers
- 88573
- MAR-88573
- Marantec 88573 power board
- Marantec 88573 relay power board kit
- M4500E power board
- M4700E power board
- M4900E power board reference
Technician Note
If the power board has failed visibly, inspect the motor, harness, line power, and any signs of moisture or surge damage. Installing a new power board into a shorted circuit can damage the replacement part.
Before Ordering
- Confirm the opener model and parts diagram call for 88573
- Compare the board connectors and relay layout to the original board
- Inspect motor leads and harnesses for shorts or heat damage
- Check that the door moves freely and is properly balanced
- Keep the 88573 power board separate from the 97798 logic board when ordering
Important Ordering Warnings
- High-voltage sections may be present inside the opener. Disconnect power and use a qualified technician if you are not trained for electrical service
- Do not substitute this board for Synergy or RV 8000 boards by appearance
Professional Advisory
Disconnect power before servicing a garage door opener. If the opener has damaged wiring, signs of heat, repeated fuse failure, unsafe door movement, or a door that will not balance by hand, have the system checked by a qualified garage door technician before replacing parts.
Product Questions and Answers
What is the difference between 88573 and 97798?
The 88573 is a relay power board kit. The 97798 is a logic board kit. They perform different jobs and are not interchangeable.
Which opener models commonly use 88573?
It is commonly associated with M4500E, M4500EL, M4700E, M4700EL, and some M4900E parts references.
Can a bad power board cause the motor not to run?
Yes, but the motor, harness, door balance, power supply, and logic board should also be checked before replacing the board.
Should I replace this board if it has burn marks?
Visible heat damage is a serious sign, but the cause should be found before replacement so the new board is not damaged.
Is this board used on Synergy LC openers?
No, not as a general rule. Synergy LC uses different control parts and should be matched by its own parts diagram.
