General Troubleshooting
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 96
Burner Troubleshooting
Diesel Burner Troubleshooting
This section will assist in troubleshooting the Aqua-Hot
diesel burner.
If additional assistance if needed, please contact the
technical support department at 574-AIR-XCEL (574-247-9235).
Troubleshooting Procedure:
1. If this unit has been inactive for an extended period of
time, perform the diesel service prior to beginning these
troubleshooting steps. The annual service will typically
resolve many common issues which may impede unit
operation.
2.
Locate the fluid overflow bottle and ensure that it is filled
to at least the COLD mark.
3. Remove the cabinet access panel from the front of the
Aqua-Hot.
4. Verify that the 20A fuse included as part of the diesel
harness is functional. Replace if necessary.
5. Move the burner on the interior control panel to the ON
position.
6. Make sure the interlock switch is depressed.
7. Verify that 12V DC power is present at Pin B4 of the diesel
burner controller.
• If 12V DC is not present, check the ETS module for
functionality by following the directions on Page 22.
Figure 166
8. Locate the left and right high-limit thermostats and press
the red center button on both thermostats to reset.
• Test for continuity on both thermostats. Both should
have continuity after reset. If one does not have
continuity, follow the instructions on Page 26 to
replace one or both.
9. Check the ignition electrodes for functionality by following
the directions on Page 59.
10. Troubleshoot the ignition coil referencing the procedure
on Page 61.
11.
Ensure that the flame sensor is functioning properly by
completing the procedure on Page 57.
If at this stage the diesel burner is still not operational,
contact technical support at 574-AIR-XCEL (574-247-9235) for
assistance to diagnose and repair the diesel burner.
Figure 167
