Pentair MasterTemp Pool Heater Transformer, 115/230V | 42001-0107S
Pentair
SKU: 42001-0107S
Pentair Dual Voltage Transformer Kit for MasterTemp® & Max-E-Therm® Heaters | 42001-0107S
The Pentair 42001-0107S is an OEM dual voltage transformer kit used in the electrical system of select Pentair MasterTemp and Sta-Rite Max-E-Therm pool/spa heaters. This transformer converts incoming 115V or 230V line power to the proper low-voltage required by the heater control circuitry for safe, reliable operation.
Key Features
- Dual voltage (115/230V): supports heaters wired for either 115V or 230V supply (as configured by the heater wiring diagram).
- OEM replacement kit: designed for correct fit, mounting, and electrical characteristics in compatible heaters.
- Restores stable control power: helps resolve issues caused by a failed or weak transformer (no power to controls, intermittent operation, erratic display, or control faults).
- Service-friendly replacement: replaces the transformer assembly without needing to replace the entire control board.
Compatibility
- Used on: Pentair MasterTemp heater electrical systems (where the parts diagram calls for 42001-0107S)
- Used on: Sta-Rite Max-E-Therm heater electrical systems (where the parts diagram calls for 42001-0107S)
- Tip: Confirm your heater model and revision by referencing the heater data plate and parts list before ordering.
Common Symptoms of a Failing Transformer
- Heater control panel/display is blank or will not power up
- Intermittent resets, flickering display, or random control faults
- Heater will not ignite due to loss of proper low-voltage control power
- Burnt smell, heat discoloration, or visible damage on the transformer assembly
Specifications
- Brand: Pentair
- Part Number: 42001-0107S
- Type: Transformer kit (heater electrical system)
- Input: 115V / 230V (heater-configured)
- Application: Pool & spa gas heater control power (MasterTemp / Max-E-Therm)
- Quantity: 1 kit
Installation Notes
- Turn off power at the breaker before opening the heater and servicing electrical components.
- Verify the heater is configured for the correct incoming voltage (115V vs 230V) before reconnecting wiring.
- Transfer wires one at a time and confirm all connections are fully seated and secure.
- After installation, restore power and confirm the control panel powers up and the heater runs normally.
- Electrical service should be performed by a qualified technician.
Related Products
- Search Aqua Pool Supply for 42001-0107S
- Pentair MasterTemp heater parts
- Sta-Rite Max-E-Therm heater parts
- Heater igniters
- Heater pressure switches
- Heater thermistors & temperature sensors
- Heater gaskets & seals
Maintenance Tips
- Keep the heater area dry and ensure the cabinet is properly closed to reduce corrosion on electrical components.
- Use proper bonding/grounding and correct breaker sizing to help protect electronics from voltage issues.
- If you experience repeated electrical failures, verify supply voltage stability and inspect for water intrusion or rodent damage.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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