Preheater Troubleshooting
General Troubleshooting Symptoms
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| Fault | Probable Cause | Remedy |
| The preheater is switched to the OFF position. | No combustion after start or repeat start of the machine preheater. | Control unit will switch to error lockout. Switch the heater off and on. |
| Flame extinguishes during operation | If a no-heating condition persists contact your Caterpillar dealer. | |
| The preheater overheats due to low coolant level. | Replenish coolant. After allowing the unit cool, push the button of the temperature limiter before attempting to restart the preheater or replace the temperature limiter. | |
| Low voltage condition for more than 20 seconds | Check all fuses and connections. Check the state of charge of the battery. | |
| Machine preheater switch off caused by the temperature limiter | After the unit cools down, push the button of the temperature limiter before restart or, replace temperature limiter. | |
| The preheater does not recognize the flame on startup. | Check the monitor for the flame and check the connections. |
Note: In many cases, the probable cause of failure may be the burner. Perform a visual inspection of the burner.
ReferenceFor additional information on a visual inspection of the machine preheater, refer to Systems Operation/Testing And Adjusting, "Visual Inspection" for the machine that is being serviced.
Troubleshooting Symptom After Switch-Off
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| Fault | Probable Cause | Remedy |
| No function | Electrical wiring, fuses | Check the fuses. Check the battery connections. Replace the control unit. |
| The control unit is suspect. | Replace the control unit. | |
| 1 Flash pulse F 01 (no start) | Fuel system | Check the fuel level. Check the fuel filter. Bleed the fuel system. |
| Combustion air/exhaust duct | Check the combustion air/exhaust duct for foreign matter and clean as required. | |
| Burner | Clean the burner or replace the burner. | |
| 2 Flash pulses F 02 (flame-out during operation) |
Fuel supply | Check the fuel level. Check the fuel filter. Bleed the fuel system. |
| Burner | Clean the burner or replace the burner. | |
| 3 Flash pulses F 03 (low voltage) | Electrical power supply | Check the battery (load test). Check the electrical connections. |
| 4 Flash pulses F 04 (flame sensor continuously hot) | Flame sensor is faulty. | Replace the flame sensor. |
| 5 Flash pulses F 05 (flame sensor) |
Wiring | Check the wiring for damage, open connections and short circuits. |
| Flame sensor is faulty. | Replace the flame sensor. | |
| 6 Flash pulses F 06 (temperature sensor) | Wiring | Check the wiring for damage, open connections, and short circuits. |
| Temperature sensor is faulty. | Replace the temperature sensor. | |
| 7 Flash pulses F 07 (fuel metering pump) | Wiring | Check wiring for damage, open connections, and short circuits. |
| The fuel metering pump is faulty. | Replace the fuel metering pump. | |
| 8 Flash pulses F 08 (combustion air fan) | Wiring | Check wiring for damage, open connections and short circuits. |
| the combustion air fan is faulty. | Replace the combustion air fan. | |
| 9 Flash pulses F 09 (glow pin) | Wiring | Check wiring for damage, open connections and short circuits. |
| The glow pin is faulty. | Replace the glow pin. | |
| 10 Flash pulses F 10 (temperature limiter) | Coolant circuit | Check the coolant level. Bleed the coolant circuit. Reset temperature limiter |
| Wiring | Check wiring for damage, open connections and short circuits. | |
| 11 Flash pulses F 11(coolant circulation pump) | Wiring | Check wiring for damage, open connections and short circuits. |
| The coolant circulation pump is faulty. | Replace the coolant circulation pump. |
After three consecutive attempts to start the preheater, the preheater and the control unit are locked out. No further attempts are possible.
Once the preheater fault lockout has been eliminated, remove the fuse and wait for 5 seconds. Reinsert the fuse. Switch the heater to ON.
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