Deutz Fault Code
Free · no signupCode 3-1-1 / SPN 110 FMI 0
Red Stop Lamp / Active Engine Derate
System
Cooling
Symptom
Red Stop Lamp / Active Engine Derate
Diagnosis & fix steps
LOGIC: Engine Coolant Temperature Exceeds High Critical Limit (>105°C).
ACTION: Clean debris out of radiator/oil cooler core matrix. Check coolant level in surge tank and inspect thermostat opening temperature and fan belt tension.
Red Seal field insights
Thermal Safeguard: Extreme coolant temperature forces progressive fuel delivery reductions to protect cylinder head gaskets and liner seals from thermal warping.
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