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Diagnostics
Table 8.
Troubleshooting guide (continued)
Symptoms
U. No Spark.
V.
Spark present but pilot does not
light.
W. Pilot lights — Main valve does not
energize.
X. Hi-Limit switch tripping.
38
Possible Cause(s)
1.
Thermostat not calling for heat.
2.
No low voltage.
3.
Spark gap closed or too wide.
4.
Broken or cracked ceramic on
spark electrode.
1.
Loose S8600 connections.
2.
Improper gas pressure.
3.
Is spark in pilot gas stream?
4.
No pilot gas — do not use match to
test - presence of gas is easily
detected by the odor.
1.
Loose S8600 connections.
2.
Cracked or broken sensor
ceramic.
3.
Check sensor/spark lead for
continuity.
4.
Measure 24 volts from term. MV to
term. MV/PV.
1.
Unit is overfiring.
2.
Air flow too low.
3.
Defective switch.
Corrective Action
1.
Close thermostat contacts.
2.
Check for 24V across 24V terminals of S8600.
3.
Set gap to 0.1.
4.
Replace pilot assembly.
1.
Check all connections, term. PV feeds 24V to pilot valve.
2.
Check pressure—pressure that is either too high or too low
may cause a problem.
3.
Spark should arc from electrode.
4.
Check pilot line for kinks. Ensure there are no drafts.
1.
Check connections-term. MV feeds main valve.
2.
Replace pilot assembly.
3.
Replace if needed.
4.
If present, replace main valve; if not, replace S8600 Igniter.
1.
Manifold pressure too high; adjust. Burner orifices may be
too large: verify/replace if required.
2.
Increase air flow; check fan size. Check for proper voltage.
3.
Replace.
GMND-SVX01B-EN
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