F6

[john brown]

control board reads F6 what can be the problem

[p_p]

On What Equipment?

[The Viking]

For example, if it's on a Daikin A/C unit, then it means that there has been abnormal temperature of the outdoor heat exchanger. (here in UK, that would most likely be a faulty sensor, where you are, I guess it could be really hot especially if the unit is in the sun)

[Brian_UK]

control board reads F6 what can be the problemWho knows? Have you read the manual/instructions?

Some information regarding what control board you are talking about would be helpful.

Oh yes, welcome to the forum, your brief introduction was omitted.