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Is 24 VAC available
at transformer?
Is 24 VAC present from terminal
THS(2) to ground?
Is power available
to primary?
Are thermostat contacts and
hi-limit control contacts closed?
Reset
or replace
hi-limits
Check continuity of wiring to
determine why voltage does
not exist at THS(2).
Is jumper installed
from terminal 5 to
ground?
Install
Jumper.
Replace
Transformer.
Determine why
voltage is not
present.
Open thermostat contacts for 30 seconds.
Close contacts and wait for prepurge (if applicable)
period. Is spark present now?
Turn off supply voltage.
Check high voltage cable.
Is it securely attached
to DSI module?
Securely attach wire
to DSI module
Is condition of high voltage
cable good (not brittle,
burnt, or cracked)?
Replace high
voltage cable
Is spark electrode
ceramic cracked
or is electrode
grounded out?
Replace
DSI module
Replace spark electrode
assembly.
System was in lockout.
Observe a complete operating
cycle to determine why
control locked out.
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
h. Troubleshooting Flowchart - Quick Reference...
First Visual Check
No Spark And System Does Not Work