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3) Air Turbulence
If there is sail switch flutter due to air turbulence or improper impellor (fan/blower) rotation or a
restriction in the exhaust duct work, the DSI (Direct Spark Ignition) module will cycle erratically.
This in turn might cause the DSI module to LOCKOUT (where the L.E.D. indicator will LIGHT
RED CONTINUOUSLY).
a) If air turbulence cause the flame to move away from the flame-probe electrode (of the Ignitor/
Flame-Probe Assembly), or if the flame goes out completely during the heat (flame) cycle, the
DSI module will attempt to reestablish a flame by going into a re-ignition cycle.
4) Direct Spark Ignition (DSI) Module
If there is some sort of operational interference in the DSI system, the DSI module (acting as the
controller for the system) will go into a LOCKOUT mode (where the L.E.D. [light emitting
diode] indicator will LIGHT RED CONTINUOUSLY).
a) Operational interference is any adverse condition (whether internal or external) to the system.
(Electrical noise is considered external noise interference because it can cause the DSI module
to cycle erratically.)
NOTE: To reset the DSI module if it is in the LOCKOUT mode, Burner Control Fault will display.
To clear this fault press the CLEAR/STOP key.
If the GAP, the ALIGNMENT, and the POSITION of the Ignitor/Flame-Probe Assembly are
correct, if the gas flow and pressure is constant and consistent; if there is no adverse air turbulence;
and if the DSI module remains in the LOCKOUT mode (where the L.E.D. indicator will
LIGHT RED CONTINUOUSLY) then, there is a malfunction with the DSI module itself, and
it must be replaced.
NOTE: To reset the DSI module if it is in the LOCKOUT mode, Ignitor Control Fault will display.
To clear this fault press the CLEAR/STOP key.
5) Wiring
If the DSI module is in the LOCKOUT mode (where the L.E.D. indicator will LIGHT RED
CONTINUOUSLY), and the mechanical components have been checked (i.e., the Ignitor/Flame-
Probe Assembly, the gas valve, etc.), then, there may be a problem somewhere in the DSI system
wiring.
a) Check ALL the wiring within the DSI system, especially the ground connections at the DSI
module and the Ignitor/Flame-Probe Assembly.
NOTE: Check for any possible damage to the ceramic insulators on the ignitor electrode and the
flame-probe electrode of the Ignitor/Flame-Probe Assembly.
b) Make sure the flame-probe electrode of the Ignitor/Flame-Probe Assembly is positioned no
more than 1-inch (2.54 cm) maximum from the burner tube.