Table 3-2., each step consisting of two digits or two letters. A 1/4 second delay separates one check
segment from the next. Observation of this check will confirm that the Diagnostic Display is operating
correctly. Should the segments not appear as illustrated in Table 3-2, refer to Section 5.5.2.
00 - 11 - 22 - 33 - 44 - 55 - 66 - 77 - 88 - 99 - AA - BB - CC - DD - EE - FF
Table 3-2. Diagnostic Display Segment Steps
The Heater then enters Stage 03. The Vent Fan speed will adjust in preparation for the ignition process
and the Heater will begin to deliver fuel to the Burner. A number of parameters will be monitored and
components checked for failure.
When the Heater has achieved ignition, the Igniter automatically turns off, the Control Box Lamp illuminates
and the Diagnostic Display will read 04
If all systems are operational, immediately after ignition the Heater will automatically ramp the Burner and
Vent Fans to full speed, the display will read 05.
While the heater is setting itself for full Run mode, the display will read 06.
Shutdown Purge Mode
Full Heat Ramp
Enter Run Mode
Low Heat Mode
High Heat Mode
Table 3-3. Operating Modes
When the Heater is in Run mode, the Diagnostic Display indicates either 07 (Low Heat mode) or 14 (High Heat mode),
depending on which heat mode has been selected. At any time during Start Up or Run mode the Heater can be switched
into Low (30,000 BTU/Hr), or High Heat (60,000 BTU/Hr).
Note: The M1A1 Tank ONLY is equipped with the ability to run the heater in "Vent
Only" Mode. In this case the Diagnostic Display reads "99", and the Control Box
Lamp will flash with a cycle comprising two quick flashes followed by a two (2)