June 5, 2025
The Brain Behind Your Appliances: A Deep Dive Into Control Boards
Every modern washer and dryer relies on one essential part to function properly: the control board. This small but powerful component acts as the brain of your appliance, managing everything from cycle timing to sensor inputs to motor speed. If you've ever wondered how your washer knows to rinse after a wash or your dryer stops when clothes are dry, thank the control board.
What Is a Control Board?
A control board, or PCB (Printed Circuit Board), is the central command center inside your washer or dryer. It receives input from sensors, interprets user commands, and sends signals to components like the motor, valve, pump, and heater. It governs cycle duration, spin speeds, water levels, and even communication with smart devices in connected models.
From Dials to Digital: How Control Boards Evolved
Older appliances used mechanical timers and rotary switches. These analog systems were simple but limited. Starting in the 1980s, electronic modules began replacing them. Today's machines run on fully digital control boards with microprocessors, memory chips, and, in many cases, Wi-Fi capability.
- Pre-1980s: Mechanical timers and knobs
- 1980s–2000s: Basic electronic control modules
- Today: Digital PCBs with smart features and diagnostic tools
Why Control Boards Matter in Repairs
As appliances became smarter, so did their control systems. That means troubleshooting often starts with the board. Most modern units can run diagnostics and display error codes when something fails. But the control board itself can also be the problem—especially if:
- The appliance won’t power on
- It behaves erratically or skips steps
- You see strange error codes that don’t relate to sensors or other parts
Technicians now use tools like multimeters, EEPROM programmers, and software readers to diagnose board issues accurately.
Common Control Board Failures
- Burned relays or resistors
- Power surge damage
- Software corruption
- Broken connectors or loose wire harnesses
Thinking About Replacing Yours?
If you’re considering replacing a control board, here are some things to keep in mind:
- Match the part number exactly. Model number alone may not be enough.
- Check for updated versions. Some boards have newer revisions with added compatibility.
- Used or refurbished can work—just buy from a trusted source with return protection.
- Some boards require software configuration after installation.
Trends Shaping the Future
Control boards are at the center of several 2024 appliance trends:
- Smart home integration: More machines feature app control, voice activation, and real-time notifications.
- Right to repair legislation: Increased pressure on manufacturers to make boards available and serviceable.
- Repair over replacement: With appliance costs rising, more consumers are choosing to repair boards instead of replacing the whole machine.
Final Thoughts
The control board is one of the most important parts in your washer or dryer—and one of the most misunderstood. Knowing how it works and what to watch for when it fails can save time, money, and frustration.
Whether you’re a DIYer or a pro technician, finding a quality replacement board can make all the difference. At A-Z Appliance Parts, we stock a wide range of new and tested used control boards for major brands. If you're not sure what part you need, our team can help match it for you. Keep your appliance running—and your laundry routine smooth—with the right part from A-Z.
