TM 9-2540-207-14&P
E4 - REVERSE BURNER AIR FLOW
E4
Burner Fan is measuring reverse air through the heater, or is operating out of range
CHECK/POSSIBLE CAUSE
REF.
REPAIR
1
Check that ducting of the
2.2
Reconnect combustion air ducting correctly
combustion air system to the
Restart Heater
inlet and the exhaust ducting
are correctly attached to the
heater
2
Check that Combustion air and
Remove obstructions
exhaust ducting is free from
Restart Heater
obstructions
3
Check for carbon accumulation
5.3
Remove carbon and clean Combustion
or obstructions in Combustion
Assembly
Assembly
Restart Heater
Check condition of Flame Tube
5.3.2
If distorted, replace Flame Tube AND
and Burner Chamber
5.3.5
Burner Chamber
Restart Heater
4
Defective Burner Fan
5.5.4
Replace Burner Fan Plate
Restart Heater
5
Defective Heat Exchanger
5.4.1
Replace Heat Exchanger
Restart Heater
6
Defective Electronic
5.2.5
Replace Electronic Programmed Controller
Programmed Controller Board
Restart Heater
6-18