Marantec 105470 Transformer Box 120V/22V/14A ES for Synergy 370 and 380
The Marantec 105470 transformer box is the replacement power transformer assembly used on select Marantec Synergy 300 Series operators that require the 120V to 22V/14A ES transformer configuration. In the operator, this component helps convert incoming household power into the low-voltage power the opener needs for its control electronics and related circuits. When a transformer box is weak, damaged, overheated, or no longer producing the correct output, the opener may appear dead, act intermittently, lose accessory power, or fail to respond even though incoming power is present.
This is a model-specific electrical service part, not a universal Marantec transformer. The 105470 part number is commonly associated with Synergy 370 and Synergy 380 operators and should be matched against the original transformer label before replacement. Similar Marantec transformer boxes, including 105469, 122944, 122945, and 158869, can look related in search results but are used for different opener families or output ratings. Correct transformer selection matters because the wrong output rating can damage the control electronics or create unsafe operation.
Compatible With
- Marantec Synergy 370 garage door operators when the parts diagram calls for 105470
- Marantec Synergy 380 garage door operators when the existing transformer label matches 105470
- Select Marantec Synergy 300 Series operator heads that use the 120V/22V/14A ES transformer box
- Residential Marantec sectional-door opener installations using the matching USA transformer configuration
- Not intended for Synergy 260, 270, 280, Synergy Solo, M-Line, Q-Line, or EOS models unless the parts diagram specifically lists 105470
Features and Specifications
| Manufacturer | Marantec |
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| Product Type | Transformer box / power transformer assembly |
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| Part Number | 105470 |
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| Application | Low-voltage power supply assembly for select Synergy 300 Series garage door operators |
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| Compatible Operator Type | Residential Marantec garage door openers |
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| Input Voltage | 120 VAC, USA applications |
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| Output / Rating | 22V / 14A ES as listed in the product name |
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| Common Model Family | Synergy 370 and Synergy 380 |
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| Installation Notes | Requires safe disconnection of power and proper reconnection inside the operator head |
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Also Known As / Related Part Numbers
- 105470
- MAR-105470
- Marantec 105470
- 105470 transformer box
- Transformer Box 120V/22V/14A ES
- Synergy 370 transformer box
- Synergy 380 transformer box
- Related but not interchangeable without verification: 105469, 122944, 122945, 158869
Technician Note
Check for the exact part number on the existing transformer label before ordering. If the opener is completely dead, confirm outlet power, cord condition, fuse or protection devices, and control box condition before replacing the transformer.
Before Ordering Checklist
- Confirm the opener is a Marantec Synergy 370 or Synergy 380, or another model whose parts diagram lists 105470
- Match the original transformer label and voltage rating
- Inspect the control box and wiring for surge or heat damage
- Do not substitute a similar transformer with a different voltage or output rating
- Disconnect power before service and use a qualified technician for internal electrical work
Professional Advisory
This part is inside the powered operator head. Do not work on live wiring, bypass safety circuits, or guess at transformer wiring. If there is any sign of burned wiring, moisture intrusion, or repeated fuse failure, have the opener inspected before installing a replacement transformer.
Important Ordering Warnings
- 105470 should not be confused with 105469, which is a different transformer rating used on other Marantec applications.
- A failed transformer may be a symptom of another electrical issue, including surge damage or a shorted accessory circuit.
Product Questions and Answers
What Marantec models commonly use the 105470 transformer box?
The 105470 transformer box is commonly associated with Marantec Synergy 370 and Synergy 380 garage door operators when the original parts diagram or transformer label confirms that number.
Is Marantec 105470 the same as 105469?
No. 105470 and 105469 are related Marantec transformer box numbers but they have different listed output ratings and should not be swapped unless Marantec documentation confirms the change.
What symptoms can point to a failed transformer box?
Possible symptoms include a dead opener, intermittent control power, no low-voltage accessory power, or no response from the control electronics after incoming outlet power has been confirmed.
Does this transformer require programming after installation?
The transformer itself does not normally require programming, but the opener may need normal setup checks after service, including travel, force, safety sensor, and accessory operation.
Can a homeowner install this part?
Because this part involves internal operator wiring and line voltage, installation should be performed by a qualified garage door technician or electrical professional.
