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Diagnostic Status Indication
The ignition module has an LED that indicates the status of the
ignition safety circuits. The flashing op er a tion of this LED
indicates the di ag nos tic status of the ignition control module. The
following listing gives the flashing diagnostic status codes as
signaled by the ignition module.
D. C. MICROAMP METER
IGNITION
MODULE
FIG. 65 Flame Current Measurement on the HSI Module
Proven Pilot Hot Surface Ignition System
Pre-purge Time
15 Seconds
Hot Surface Igniter Heat-up Time
25 - 35 Seconds
Main Burner Flame Establishing Period
4 Seconds
Failure Response Time
0.8 Seconds at < 0.5 µA flame current
Post-purge Time
30 Seconds
TABLE - Y
Ignition and Control Timings
TABLE - Z
Ignition Module Status LED Diagnostic Codes
Code Sequence Condition
Constant ON System OK, no faults present.
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Constant OFF Possible control fault, check power; LED may be defective, do not replace control if all operational
sequences function properly - see Trouble Shooting Guide.
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One Flash Low air, check air pressure switch and hoses to pressure sensing points, blower start-up/proving
blower, venting and sealing of pressurized chamber. Note: Brief flashing normal on blower startup.
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Two Flashes Flame without call for heat, check for a gas valve stuck in the open position, air, venting, burners and
the combustion process. Blower will remain on.
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Three Flashes Lockout due to flame failure, push reset button on inner control panel after correcting ignition problem.
Initial heater start up without properly bleeding air from the gas line may require multiple reset
functions to achieve proper ignition.
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Four Flashes Igniter failure, igniter will not maintain minimum 2.7 amp current draw, caused by low voltage, bad
wiring/continuity, high resistance or igniter failure.
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Five Flashes Power supply problem, check for low supply voltage or transformer output less than 18 VAC.
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Six Flashes Replace ignition module, internal fault.