Does the burner lite and then
immediately go out?
16
4.0
Troubleshooting Guide
Continued from page 14.
AG2
Series
After the ignitor is warmed up,
does the gas valve open?
Does the burner light?
Yes
Test for 24V at gas valve
during opening period (30-45
seconds after power to the
heater). Is there 24V to the
gas valve for 8 seconds?
No
No
The circuit board
and/or wiring
harness is faulty
and should be
replaced.
Confirm that gas pressure is within maximum and minimum inputs
as indicated on the heater’s rating plate. Is gas pressure OK?
Yes
Correct
problem.
Replace gas
valve.
Is the ball valve in
the ON position?
No
Yes
Confirm that gas pressure is within
maximum and minimum inputs as
indicated on the heater’s rating
plate. Is gas pressure OK?
Yes
Correct
problem.
Purge air from
gas lines.
Yes
Does the burner stay lit?
No
Yes
Does the burner
stay lit for at least
8 seconds and
then shut off?
Yes
Is the heater properly grounded?
Is the heater’s polarity correct?
Correct
problem.
Yes
Yes
No
No
No
No
Yes
Troubleshooting
ends.
Does the burner stay lit until
the call for heat ends?
Yes
The following can cause the heater to shut down:
• Improper grounding.
• High winds.
• Taking combustion air from attic space.
• Dirty environment.
• Improperly positioned baffle.
• Fluctuation gas pressure.
No
