[wayne1178]

I am working on a split system. The contactor, cap, breaker, sub panel, all checks out good. I have no indicator lights, that indicates a power problem. How do I check the circuit board? or any recommendations?

[cascadehvac]

did you verify power at the unit? if the power is to unit and you have no indicator lights, i would check xformer next. if that is suppying 24 volts to board, then the on board fuse or board must be bad

[NoTime]

What are you working on? M/N Looks like A/C or H/P. Do you have 24V?

[refermadness]

do you have proper line voltage did you look at the back of the circuit board for burn marks?