Misakomo Control Board Kit for Pentair MasterTemp & Sta‑Rite SR 42002-0007S — Upgraded Capacitors & Waterproof Coating

If your MasterTemp or Max‑E‑Therm heater fails to light, shows a blank or erratic display, or heats slowly, the cause is often a failing control circuit board. This Misakomo kit (42002‑0007S) is built to match the original form, fit and function for Pentair MasterTemp 200/250/300/400 and Sta‑Rite SR200/SR333/SR400 units and includes the compatible switch membrane pad replacement. The board is manufactured with improved components and protective coatings to withstand moisture and heat typical in pool equipment bays.

How does this control board restore heater operation?

Replacing a worn control board returns the heater’s ability to process inputs, operate the ignition sequence, and display status. The Misakomo board uses upgraded capacitors and power components to deliver more stable electrical control and faster response to commands.

• Direct replacement for OEM numbers 42002‑0007S and 461105.
• Includes switch membrane pad compatible with 42002‑0029Z / 472610Z.
• Upgraded solid‑state capacitors and power chips for steadier output.
• SR waterproof coating for improved moisture protection in heater enclosures.

Will this fit my specific Pentair or Sta‑Rite heater model?

The kit was designed to be compatible with the common MasterTemp and Max‑E‑Therm NA/LP series. It fits multiple MasterTemp generations and Sta‑Rite SR models used in residential pool and spa heating.

• Fits Pentair MasterTemp 200, 250, 300, 400 series.
• Compatible with Sta‑Rite SR200NA, SR333NA, SR400NA and HD variants.
• Works with NA/LP series electrical systems, including units listed under part 460805.
• Use model and serial to confirm compatibility before ordering.

What improvements does this replacement offer over an aging board?

Beyond restoring basic function, the Misakomo control board brings component and assembly upgrades designed for longer, more reliable service. Those enhancements reduce the chance of electrical faults and help the heater respond more consistently to control inputs.

• High‑precision soldering and FR‑2 copper foil laminate for durable circuitry.
• Upgraded optocoupler and regulated power module with protective features.
• Protections against overheating, overvoltage and short circuits.
• Improved leakage resistance from SR waterproof coating.

How difficult is installation and what should I prepare?

Installation requires basic electrical safety skills and familiarity with pool heater wiring. If you are comfortable shutting off power, documenting wire locations, and removing the heater’s control cover, the swap is straightforward; otherwise hire a licensed technician.

• Turn off all power and confirm with a meter before starting.
• Take photos or label connectors to preserve wiring order.
• Handle the board by edges and avoid static discharge to components.
• Test the unit with power restored and observe operation before closing the heater.

Who is this for? Pool and spa owners, service technicians, and maintenance professionals who need a dependable, drop‑in control board replacement for Pentair MasterTemp and Sta‑Rite Max‑E‑Therm heaters will benefit. Choose this kit when your heater will not ignite, the control panel is blank or unreliable, or you want an upgraded replacement that improves moisture resistance and electronic protection while retaining original compatibility.