Download 13500A, Troubleshooting Flowchart

HELLFIRE Models 900 and 900 2005 Gas Fired Switch Heater
Troubleshooting Aid Flowchart
Mode selector switch is
toggled to "Manual"
note the sequence of
LEDs on the FSR.
1) the pilot lights.
2) the flame does not
light.
3) the power and alarm
light remain lit.
Flame signal?
Inadequate gas
pressure?
Yes
1) verify supply
pressure is between 520 psi.
2) verify that the pilot
gas solenoid is
energizing and
opening.
3) verify that the
manual pilot gas
shutoff valve is open.
No
Yes
Intake severely
blocked?
Yes
Remove flame rod
and clean. Visually
inspect for physical
damage. To
confirm, see the
flame rod check
instructions in the
service check
section of the
manual.
Clear intake of
any snow or
debris. Once
cleared the air
switch will close
and the trial for
ignition will
proceed.
No
No
Air switch open?
Air in gas line?
Yes
No
No
Yes
To confirm, remove the
lead from, but hold it
close to the spark plug
. Reset and start the
heater . If a spark
between the plug and
the lead, and the
burner still does not
light, then inspect or
replace the the plug. If
there is no spark then
inspect or replace the
ignition transformer.
Air switch blocked?
Yes
No
No
Ignition system
faulty, no spark?
Yes
Purge air from line. For
a small amount of air a
couple of start up
attempts may be
adequate.
Calibrate air switch as
per the instructions in
the service check
section of the manual.
Main gas or safety gas
solenoid valve not
opening?
Yes
13500A HELLFIRE Models 900 and 900 2005 Switch Heater Troubleshooting Flowchart Aid.doc
Page 4 of 6
Clear
blockage?
Cycle the heater by
turning it off and
on. Listen for the
solenoids to "Snap"
when the FSR
energizes them, as
indicated by the
"Main" LED. If no
"Snap" is heard
inspect the coil and
wire terminations.
If a "Snap" is heard
service the gas
valve.
ECN 2681