Diagnostic Status Indication

The ignition module has an LED that indicates the status of the ignition safety circuits. The flashing operation of this LED indicates the diagnostic 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

TABLE - Y

Ignition and Control Timings

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 - 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.

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Lochinvar 000, 1 Table Y, Ignition and Control Timings, Table Z, Diagnostic Status Indication, Code Sequence Condition
Page 49 Page 51

000, 000 through 2, 1 specifications

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