Hello I have an IGT S+ that keeps throwing a 43 ( Reel #3 Tilt) and 21 (Coin in Error) code. I have checked with known working main boards and known working reels and it still throws the code during game play. It happens intermittently it can play for 10 minutes to an hour then the code 43 and sometimes code 21 comes up. I have checked pretty much everything mentioned about these codes in other posts about solving these codes. Any other suggestions about what it could be? Bad reel harness? Bad power supply? I'm kinda at a lost here. Thanks for any tips.
Turned out to be bad coin optics, The optics would work at times but needed new ones, all good now. Once I changed them no more 21.
Thanks for all the help.