Tw230 chipper speed fault 2 in feed won’t stay on only when bitten held on

[John sue]

Hi, I have a Timberwolf 2017 TW 230 diesel chipper the infeed roller button. There’s no longer its own when pressed if I hold my finger on it it will stay working. All the other controls are working. I’ve checked all the switches when the machine gets up to full revs. A red light comes on saying speed fault two and the hydraulic thing lights up red when I press the feed button it works but I need it to stay on on its own when feeding please can anybody help me? I’ve also checked the wire loom and plug all looks good and the relays all good