Deutz Spn 523891 Fmi 14 Engine Fault Code
Check the description:Spn 523891 Fmi 14 Description:
"When AirHt_ctDefSRCLoOn_mp is lower than AirHt_ctMaxDef_C.DFC to SRC Low error when heater is on."
"When AirHt_ctDefSRCLoOn_mp is lower than AirHt_ctMaxDef_C.DFC to SRC Low error when heater is on."