1. Incorrect manifold pressure or input.
2. Voltage to unit too high.
3. Air through put too high.
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 Ñ 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. Vertical run of ß ue is too short.
(standard units only as Category
I
).
2. Unit is overÞ ring.
3. Air ß ow too low
4. Defective switch.
V. Cold air is delivered during
heater operation.
W. NO Spark (if applicable)
X. Spark present but pilot does
not light. (If spark is applic-
able).
Y. Pilot lights Ñ Main valve
does not energize.
(Spark units only).
Z. Hi-Limit switch tripping.
1. Refer to "Operation".
2. Check motor voltage with fan running.
Should be 115 volts AC.
3. Refer to "Operation".
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 Ñ 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. Insure
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. Lengthen vertical run of ß ue pipe
(see venting).
2. Manifold pressure is to high; adjust.
Burner oriÞ ces may be too large:
verify/replace if req'd.
3. Increase air ß ow; check fan size.
Check for proper voltage.
4. Replace.
21
Troubleshooting Guide
SYMPTOMS
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
Содержание M)
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