ADC AD-200 service manual First Visual Check

d. Troubleshooting Flowchart - Quick Reference...

Computer/Timer Calls For Heat

Is spark evident (on)

No

at Ignitor Assembly?

Yes

Go To Chart 2

Replace the DSI Module.
Energize system and check	Yes
for proper operation.

First Visual Check

(Does Ignitor Spark?)

Is 24 Volts

present across DSI Module terminals

TH and COM?

Yes

Check

High Voltage (HV) Lead for nicks or cracking, where sparking to ground may occur. Is this wire

damaged?

No

Visually inspect Spark Electrode Assembly. Is ceramic cracked or Spark Electrode incorrectly gapped?

No

Visually inspect High Voltage (HV) Wire

connections at both DSI Module and Ignitor Assembly.

Are connections secure?

Yes

Remove

High Voltage (HV) Wire from

DSI Module and visually inspect. Is conductor visible at end of

HV Wire?

No

Yes

Yes

No

No

Open circuit to DSI System. Check the 24 VAC power source Sail Switch and Hi-Limit.

Repair or replace HV Lead Assembly.

Energize system and check for proper operation.

If cracked, replace Electrode Assembly. Correct gap size

is 1/8" (+/- 1/32").

Energize system and check for proper operation.

1.At DSI Ignitor Assembly be sure HV Wire is secure in the boot as well as the connection to the Ignitor Probe Assembly.

2.At DSI Module, center the end of the HV Wire with a Spike Terminal. Energize system and check for proper operation.

Cut the end off of the HV Wire 1/4" at a time until conductor becomes visible and is flush with the insulation.

Reconnect the HV Wire to the Spike Terminal on the DSI Module.

Energize system and check for proper operation.

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