Troubleshooting
3Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Burner shuts off or always seeing “Burner Power Break “ fault on screen. | During the purge cycle at the initial start up the burner ignitor box receives all its power from the IQ controller. System is 120 volts and is used to power the burner and fuel system. | Test for loss of voltage at the Ignitor box in the burner assembly. (See example “B”). Terminal “N” & “L” are power in. If there is no voltage then check the IQ controller for power loss. Power into the controller red terminal block distributes voltage to the fan and burner. Check the red terminal block for power in and out (120 v). Make sure connections are secure. Check the 15 amp fuse on the left of the controller. (Example “C”). If it fails, replace it. Test for voltage into the power relay above the red terminal block. During purge power goes to relay and out into the thermal breaker. (Example “C”). If failed, replace it. |
| Safety thermostat is a protection for the high limit. If the fan has failed or heater shut down incorrectly it creates trapped heat which trips the thermostat. | Look for the black cap on the heat exchanger below the main blower fan. (Example “A”). Remove the cap and you will expose a red button. This button is connected to the safety thermostat and has to be reset. Push and hold for five seconds. If the thermostat continues to trip then give it 5 to 10 minutes for the heat to dissipate. If the problem persists then replace the safety thermostat. | |
| Burner starts to smoke and build black smoke out of exhaust stack. | Black smoke is an indication the unit is not getting enough air, bad fuel or carbon build up in the chamber. | Make sure air setting is on a specified number that the IQ controller recommends at the time of start up. DO NOT adjust air setting during operation unless the IQ controller specifies. (Any change of ambient temperature and elevation requires smaller or higher amounts of air mixture). Check for any debris or material covering or blocking the air damper. Clean and clear. Check fuel pressure and maintain 140-145 PSI at the pump. Ensure fuel nozzle NO 1 & NO 2 are both clean and working correctly. Check the schematic for a list of wiring for each nozzle. IQ logic controls both nozzles to maintain temperature. Make sure the heat exchanger and burn chamber are clear of any soot build up. If there is a large amount of build up then take the burner apart and wash with hot water high pressure hose. Let the barrel air dry before using. Make sure only NO 1 Diesel fuel is used. Any additives can cause more gel-like substances which will create fuel issues. |
Fault codes and symptom→remedy steps extracted from this unit’s service/owner documentation; verify against the official manual before servicing.
About
Caterpillar 1.5 NA T4F — light tower. Specifications and parts compiled from manufacturer documents.