Pentair Transformer 115/230V | MasterTemp & Sta-Rite Max-E-Therm Pool Heater | 42001-0107S
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- SKU:
- 42001-0107S
-
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About This Item
The Pentair Transformer (42001-0107S) is the OEM replacement transformer for Pentair MasterTemp and Sta-Rite Max-E-Therm pool heaters, rated for 115/230V operation.
⚠️ IMPORTANT: HEATER ELECTRICAL COMPONENT — PROFESSIONAL SERVICE REQUIRED
Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.
⚠️ IMPORTANT: VERIFY FITMENT BEFORE ORDERING
Confirm this transformer's application against your heater's serial number label, wiring diagram, or the original part number printed on the existing transformer before ordering.
The transformer steps down mains voltage to supply the low-voltage control circuitry in the heater's electronic control board. When the transformer fails, the heater's control board loses its operating voltage and the unit will not power on or respond to thermostat inputs. Replacing the transformer restores the low-voltage supply required for ignition sequencing, limit switch monitoring, and display operation. Match the part number on your existing transformer to 42001-0107S before ordering — the voltage rating (115/230V) must align with the heater's field-wiring configuration.
Specifications
| Pentair Part Number | 42001-0107S |
| Voltage Rating | 115/230V |
| Compatible Equipment | Pentair MasterTemp; Sta-Rite Max-E-Therm pool heaters |
| Legacy Brand Note | Sta-Rite is a Pentair brand |
Poolaroo Pro Tip
Before removing the old transformer, photograph the wiring connections on your existing unit. Transformer terminals are not always labeled identically across heater revisions, and a clear reference photo prevents miswiring during reinstallation. If the transformer shows visible burn marks, an overheated or shorted control board is often the root cause — have a qualified technician inspect the full control circuit before energizing the replacement.
