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If you are holding an old board with this number, it serves as the central control for temperature regulation. Replacing it requires matching the exact part number and wiring connections.
Specifications
- Part number: 300731
- Brand: Cleveland
- Part type: Temperature control board
- Height: 2.15 in / 5.46 cm
- Length: 4.65 in / 11.81 cm
- Width: 4.55 in / 11.56 cm
- Part number: listed as a replacement for yours
- Ignition type: same as your furnace
- Wiring: photo every wire first
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
What this temperature control board does
A temperature control board acts as the brain for the heating circuit. It takes signals from sensors and controls power to components to maintain target heat levels.
Most home control boards, contactor coils, and thermostats use a 24 V control signal from a transformer. When the board fails, the equipment may fail to start, shut down unexpectedly, or stop regulating heat properly.
Dimensions and physical specifications
Control boards must fit inside the existing control box or mounting bracket. Compare the physical dimensions of your existing unit to these stated measurements.
- Height: 2.15 in / 5.46 cm
- Length: 4.65 in / 11.81 cm
- Width: 4.55 in / 11.56 cm
How to confirm a replacement matches
Control boards look similar across different models, but internal circuits differ. Always match by part number rather than appearance alone.
Each board lists the part numbers it replaces. Check that 300731 matches the number stamped on your original board or is listed as a direct replacement. Also ensure the ignition type matches your system before installing a new board.
Safe replacement steps
Replacing a control board involves handling multiple electrical terminals. Take time to document the setup before removing the old part.
- Shut off electrical power at the main breaker and verify power is off with a tester.
- Take clear photos of every wire connected to the board.
- Label each wire to match its designated terminal.
- Remove the mounting hardware holding the old board in place.
- Mount the replacement board securely.
- Move wires one at a time to the same spots on the new part.
Read your old part
- Locate the printed label or stamp on your existing control board.
- Check that the part number reads 300731.
- Verify that the physical space matches the dimensions of 2.15 in / 5.46 cm height, 4.65 in / 11.81 cm length, and 4.55 in / 11.56 cm width.
- Confirm the ignition type is the same as your equipment.
When to call a pro
Board swaps on gas equipment can require setup and testing. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
What voltage does this control board use?
Most home thermostats, contactor coils, and control boards use a 24 V control signal from a transformer. Always verify your system voltage and shut off power before servicing.
Can I replace this board if my old part number is different?
Each board lists the part numbers it replaces. You should only use this board if your old part shows 300731 or is specifically listed as a replacement.
What should I do before disconnecting wires from the old board?
Boards have many wires. Take clear photos and label each wire before you remove anything. Move wires one at a time to the same spots on the new part.
What should I do if I smell gas during a repair?
If you smell gas, do not touch any switch. Leave the house and call your gas company from outside.
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Brand names and part numbers identify the part and show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.