MRCOOL Electronic Control Box Subassembly Control Board DIY-18-HP-230A / AE

Upgrade the brains of your MRCOOL DIY system. This Electronic Control Box Subassembly / Control Board is designed for seamless use with select MRCOOL DIY 18k central models, helping restore accurate temperature control, reliable startup, and overall system stability—without a pro visit.

Keep your MRCOOL DIY running like new.
The MRCOOL Electronic Control Box Subassembly (Control Board) is engineered for the DIY-18-HP-C-230A and DIY-18-HP-C-230AE model families to deliver precise system management and dependable performance.

Key features

• Precision control – Maintains accurate temperature regulation, compressor/fan coordination, and safe system protections.

• DIY-friendly fit – Designed for straightforward replacement to minimize downtime and avoid a service call.

• Built for reliability – Robust board design and components meant to stand up to continuous HVAC duty cycles.

• Model-specific compatibility – Matches the control logic and connectors used on DIY-18-HP-C-230A and DIY-18-HP-C-230AE models for optimal performance.*

What’s included

• Electronic Control Box Subassembly / Control Board (model-specific replacement)

Compatibility

• Intended for MRCOOL DIY-18-HP-C-230A and DIY-18-HP-C-230AE series units.

• Before ordering: verify your exact model number from the unit data plate/manual to ensure a perfect match.

Installation notes (read first)

• Disconnect power at the breaker and allow components to discharge before service.

• Take photos of wiring before removal; transfer connectors one at a time.

• Handle the board by the edges and avoid static discharge (use an ESD strap if available).

• After installation, restore power and confirm normal startup sequence and error-free operation.

• Follow all local codes; use a licensed electrician where required.

Why replace the control board?

• Intermittent starts, erratic fan/compressor behavior, or persistent control errors often trace back to a failing board. Replacing the subassembly restores proper logic and reliability.

*Model names can be very similar—double-check the suffix and voltage on your unit label. If you’re unsure, we’re happy to help confirm fitment before you buy.