Issue with my Rowe 1400 changer

[HighOctane]

I’ve got a Rowe bc1400 with a mars conversion on it that’s having an issue I’ve never seen before. The changer will take a $5 bill, not pay out the coins, and then the light on the bill stacker will flash twice and not allow any other bills. I don’t get an error on the control board. Any ideas? I’ve checked the dispenser and everything seems good: clean, each catch has the right amount of coins, no stuck coins. This has been happening intermittently but only with the $5.

 

[Randy]

The first thing I'd do is install my spare validator. If that didn't solve the problem I'd replace the control board.