The Sundance EPROM Chip, Rev 3.56, part 6660-277, is a replacement firmware chip designed to control and coordinate the essential operations of a spa system's circuit board. It interfaces directly with the PCB to manage communication between pumps, heater, sensors, and topside controls, and is compatible with select Sundance spa models using the Revision 3.56 control platform.

Specifications:

• Brand: Sundance Spas
• System firmware core — acts as the embedded software governing pump sequencing, heater regulation, filtration cycles, and safety protocols
• Revision 3.56 firmware for improved communication between system components
• Direct replacement fit — designed to match OEM specifications for compatible circuit boards requiring part 6660-277
• Durable design built for long-term reliability in spa control environments
• Supports accurate monitoring of flow switches, temperature sensors, and high-limit systems for safe spa operation
• Always verify your spa model and existing chip version before ordering to ensure proper fit
• Part no. 6660-277

Returns & installation: Confirm your spa's circuit board part number and existing chip revision before ordering, as electronic parts are non-returnable once installed. Installation should be performed with power disconnected, per your spa's service manual.

FAQ

Q: How do I know if this chip needs replacing?
A: System errors, unresponsive controls, incorrect heating behavior, or inconsistent performance can indicate a faulty or outdated EPROM chip.

Q: Will this work with any Sundance spa?
A: This chip is designed for Sundance systems using the Revision 3.56 firmware on circuit board 6660-277 — confirm your board's part number before ordering.