MBU V3 Error 3

[Thorh]

My MBU V3 gives error code 3 when i push start, I feed it with 24 V (other MBU's starts with the same power supply)....... What could be wrong ??

 

[Guyfang]

Do you have the TM's for it? Has it run right before?
@SCSG-G4

 

[SCSG-G4]

Do you have the TM's for it? Has it run right before?
@SCSG-G4

Table 1. Controller Error Codes.
Code Meaning Suggested Action
ER01 No Flame or flameout
See troubleshooting procedure “Burner fails to start or 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 after
four 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.

All from TM 10-7310-281-13&P, page 89, Work Package 0008
If the TM is not in the TM section, I can upload it. Mike

 

[Thorh]

Do you have the TM's for it? Has it run right before?
@SCSG-G4

It ran fine the last time i used it..

 

[Thorh]

Table 1. Controller Error Codes.
Code Meaning Suggested Action
ER01 No Flame or flameout
See troubleshooting procedure “Burner fails to start or 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 after
four 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.

All from TM 10-7310-281-13&P, page 89, Work Package 0008
If the TM is not in the TM section, I can upload it. Mike

I have the TM, i know err3 is undervoltage, but anoter MBU runs fine with the same power supply....

 

[Guyfang]

Look at the connections. Both input and output. Cable and plug.

 

[SCSG-G4]

Guyfang is correct. Examine the power cables and connectors on the MBU itself. That is where the problem is. If necessary, replace the wiring loom with one from another unit (preferably one that is being scrapped for other reasons).

 

[Thorh]

I notice that the igniter start to glow when i press power and it stays on..... should that not happen when you press start ??