Main Control Board

The main control board is a component that does commonly fail. There are many individual electrical parts on the board, which often leads to replacing this part rather than troubleshooting what is actually wrong.

Very important warning before replacement

The failure can be due to an external component, meaning there is the possibility that the failed external component can damage a new control board.

Therefore, do not underestimate the importance of checking the proper function of all the other external components before just swapping this board.

Common checks on the board

There are several voltages that can be measured, and these are common knowledge in many troubleshooting guides. These include the power-supply voltage of 19 VAC and the battery voltage of a standard 12 VDC battery.

There is also a lower control voltage that is used by the logic components on the board, and there is a manual override feature that can isolate components and eliminate the main control board as the problem.

However, these checks require a solid understanding of electrical troubleshooting.

A future step-by-step troubleshooting guide will include specific procedures for these tests after the other external components have been checked.