58
DES3
Series
Does the burner
stay on briefly and
then shut off?
5.0
Troubleshooting Guide
Continued from previous page.
Check the gap on the igniter.
Is the gap between 3/16 in.
and 1/4 in.?
Check that gas pressure is within minimum and maximum inputs as
indicated on the heater’s rating plate. Is gas pressure ok?
Yes
Make sure gas lines were purged of air
and/or correct pressure problems.
The following can cause the heater to shut down:
• Improper grounding.
• High winds.
• Taking combustion air from the attic.
• Dirty environment.
• Baffle not located properly.
• Fluctuating gas pressure.
No
Adjust gap.
Does the burner
stay on?
No
Does the heater stay on until
the call for heat ends?
Yes
Yes
Troubleshooting ends.
Is the heater properly
grounded? Is the
polarity correct?
Yes
No
No
Yes
Yes
No
Correct problem.
No
