TM 10-7310-281-13&P MODERN BURNER UNIT (MBU) 0009 00 TROUBLESHOOTING PROCEDURES 0009 00-6 THIS PROCEDURE COVERS: Controller Error Codes INITIAL SETUP: Maintenance Level Materials/Parts Operator None EVALUATE If any of the internal systems of the MBU experiences a malfunction, an error code may appear on the hour meter display of the control panel. The following table lists the expected error codes and internal systems that may be the cause of the malfunction. These error codes are not designed to specifically pinpoint the actual MBU assembly at fault but may serve as an aid in narrowing down the source of the malfunction. If an error code indicates a problem in an MBU subsystem that is not repairable at the Operator level, it must be referred to Unit Maintenance. Table 1. Controller Error Codes Code Meaning Suggested Action ER01 No Flame or flame-out See troubleshooting procedure  “MBU fails to start” or “MBU shuts down during operation” ER02 Overvoltage Check voltage at power source.  Check cables and connections between power source and MBU. ER03 Undervoltage Check voltage at power source.  Check cables and connections between Power source and MBU. ER04 Tank not full after4 minutes of fueling See troubleshooting procedure “MBU fails to refuel”. ER05 Flame detected If there is a flame in the burner (when there should NOT be), then extinguish it, or allow  to burn out before attempting to operate burner again. If no flame is present, then check flame sensor. ER06 Fuel sensor Check fuel sensor connection and wiring.  Check fuel sensor. ER07 Invalid key entry Press STOP button to cancel error.  Proceed with MBU operation.  If error persists, then check for sticking buttons. ER09 Fuel solenoid valve or Vent solenoid valve Check fuel solenoid connection and wiring.  Check vent solenoid connection and wiring.  Check fuel solenoid. Check vent solenoid. ER0A Air solenoid valve Check air solenoid connection and wiring.  Check air solenoid. ER11 Compressor Check compressor connection and wiring.  Check compressor. ER12 Ignitor Check ignitor connection and wiring.  Check ignitor. ER13 Compressor or Ignitor Check compressor connection and wiring.  Check ignitor connection and wiring. Check compressor. Check ignitor. ER80 ER81 ER82 Controller Cycle power.  Attempt operation again.  If error persists, replace Controller. END OF WORK PACKAGE