Cat Skid Steer Model 279D reading multiple errors but no performance issuings. Looking for help debuging! (Almost no experience fixing heavy equipment). 

Worked for a few hours yesterday and received this error: 

174-3 Engine: Engine Fuel Temperature 1 Voltage Above Normal

Error would come on and off repeatedely but no performance issues. Coolant was full, I could not find any lose or damaged wires/relays. I did run the machine close to E the previous day, but filled before operating. 

Operated today for several hours and got a new error: 

E1239-2 Machine: DPF#1 Conditions Not Met for Active Regernation. Park the machine in a safe location for regen. 

Any help is appreciated.