Hobart 00-748512 Control Board

What the Control Board Does

The control board directs the safe sequence of operation for your unit. It receives input calls from controls and checks that safety devices are closed before energizing the ignition system.

Most control boards use a low voltage control signal from a transformer to operate safety circuits and monitor the ignition process. When the board fails, the unit may fail to start, cycle off unexpectedly, or stop sending power to vital ignition parts.

Specs for Part 00-748512

When finding a replacement, the physical size and operating voltage must match your mounting space and wiring setup. The dimensions and ratings for part 00-748512 are listed below.

• Voltage: 24 Volt
• Length: 7.3 in / 18.54 cm
• Width: 5.45 in / 13.84 cm
• Height: 5.3 in / 13.46 cm

Confirming a Matching Replacement

Control boards look similar on the outside, but their internal circuits and wire connections are specific to certain setups. Always verify the numbers stamped on the board itself rather than guessing by appearance.

Match the ignition type to your system, and verify that any replacement board lists your exact part number as a direct match.

• Verify that your system runs on a 24 Volt control circuit.
• Check that the mounting area accommodates dimensions of 7.3 in / 18.54 cm by 5.45 in / 13.84 cm by 5.3 in / 13.46 cm.
• Ensure the ignition type of the replacement board matches your equipment.

How to Replace the Board Safely

Replacing a control board involves working with multiple electrical terminals. Careful labeling ensures each circuit reconnects to the proper terminal on the new board.

1. Turn off the electrical power at the breaker panel and confirm the circuit is dead using a reliable voltage tester.
2. Take clear photos of every wire and terminal connection on the old board before unfastening anything.
3. Label each wire to prevent mixing up connections during the transfer.
4. Remove the mounting screws holding the old board in place and lift it out carefully.
5. Mount the replacement board into the brackets, ensuring it fits the available clearance.
6. Move wires one at a time to the matching spots on the replacement board, referencing your photos.
7. Restore power at the breaker and test the equipment through a full heating cycle.

Read your old part

1. Turn off power to the unit and open the access panel to locate the installed control board.
2. Look at the printed label or circuit board surface to find the manufacturer part number.
3. Check that the label displays part number 00-748512 or that your replacement documentation lists it as a match.
4. Confirm that your system uses a 24 Volt control circuit matching the board specification.
5. Measure the available mounting footprint to ensure it fits the 7.3 in / 18.54 cm length, 5.45 in / 13.84 cm width, and 5.3 in / 13.46 cm height.