Pentair Dual Voltage Transformer Kit for Max-E-Therm Heater Electrical System 115/230 V 42001-0107S
$99.99
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Pentair Dual Voltage Transformer Kit for Max-E-Therm Heater Electrical System 115/230 V 42001-0107S
$99.99
The Pentair 42001-0107S is a genuine OEM Dual Voltage (115V/230V) Transformer Kit primarily used in the electrical systems of popular gas pool and spa heaters. It is responsible for stepping down incoming high-voltage power into low-voltage power (typically around 24V–26V AC) to run the heater's main control board, ignition control module, and safety switches. [1, 2, 3, 4]
Compatibility
- Pentair MasterTemp series heaters (manufactured after 2003)
- Sta-Rite Max-E-Therm series heaters [1, 2]
Key Specifications
- Part Number: 42001-0107S (often replaces older part numbers missing the "S" suffix)
- Input Voltage: Dual voltage (automatically handles 115V or 230V depending on how the heater's internal voltage selector plug is configured)
- Output Voltage: Stable low-voltage AC (24V to 26V AC)
- Power Rating: 40 VA [1, 2, 3, 4]
Common Failure Symptoms
When this transformer burns out or fails, the heater usually loses all secondary electrical functions. Common signs include:
- Dead Control Panel: The display screen on top of the heater completely turns off, and the buttons do not respond.
- No Power to the Board: Using a voltmeter reveals that incoming high voltage is reaching the heater, but no low-voltage power is exiting the transformer to supply the main circuit board.
- Blown Fuses: A failing or shorted transformer can repeatedly blow the small fuse located directly on the heater's control board. [1, 2]
Replacement Process
Replacing this component is relatively straightforward because it relies on standard slide-on wire harness plugs. [1]
- Turn off the main breaker supplying power to the pool equipment pad before opening any access panels.
- Open the heater's side panel box where the high-voltage connections reside.
- Take a quick photo of the wiring connections for reference.
- Unplug the top and bottom wire harnesses, remove the mounting screws securing the old transformer to the internal junction box, and screw the replacement kit into place.