{"product_id":"pentair_42001-0107s","title":"Pentair Transformer 115\/230V | MasterTemp \u0026 Sta-Rite Max-E-Therm Pool Heater | 42001-0107S","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003e⚠️ IMPORTANT: HEATER ELECTRICAL COMPONENT — PROFESSIONAL SERVICE REQUIRED\u003c\/strong\u003e\u003cbr\u003eGas 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.\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003e⚠️ IMPORTANT: VERIFY FITMENT BEFORE ORDERING\u003c\/strong\u003e\u003cbr\u003eConfirm 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.\u003c\/p\u003e\n\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e42001-0107S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eVoltage Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e115\/230V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eCompatible Equipment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003ePentair MasterTemp; Sta-Rite Max-E-Therm pool heaters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffffff;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eLegacy Brand Note\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eSta-Rite is a Pentair brand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePoolaroo Pro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore 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.\u003c\/p\u003e\n\n\u003c!-- wft:processed:manual:2026-05-01 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":53912383422739,"sku":"42001-0107S","price":73.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/PEN420010107S_0.jpg?v=1772793787","url":"https:\/\/poolaroo.com\/products\/pentair_42001-0107s","provider":"Poolaroo","version":"1.0","type":"link"}