42 PNEG-308 Purafire
12. Troubleshooting Guide
Possible Cause Corrective Action
6. Air proving switch does not open (one (1) flash).
1. Air proving switch binding. 1. Adjust the air switch to move freely or replace the air
proving switch.
2. Air proving switch malfunction. 2. Replace the air proving switch.
7. Air proving switch does not close (two (2) flashes).
1. Obstruction or flapper arm bent. 1. Remove obstruction, or adjust the air proving switch to
move freely, or replace the air proving switch.
2. Low air flow. 2. Check for inlet and/or discharge obstruction and clean
blower wheel. Check for loose or misaligned blower wheel.
Realign and secure. Replace damaged blower wheel.
3. Motor does not run. 3. See symptom #2 of the Troubleshooting Guide.
4. Motor tripped on thermal protector. 4. See symptom #4 of the Troubleshooting Guide.
5. Loose or broken wire. 5. Repair or replace wire.
8. High-Limit open (three (3) flashes).
1. High-Limit tripped. 1. Reset the High-Limit and review additional possible
cause shown in (2) through (5).
2. Low air flow. 2. Check for inlet and/or discharge obstructions. Clean
blower wheel. Realign and secure. Replace damaged
blower wheel. Replace weak capacitor or replace weak
motor, as applicable.
3. Over firing. 3. Check gas type (LP or NG). Check supply gas pressure.
Check manifold gas pressure. Check burner orifice size.
4. Malfunction High-Limit. 4. Replace the High-Limit.
5. Burner flame does not shut off. 5. See symptom #14 of the Troubleshooting Guide.
9. Burner lights, but will not stay lit (three (3) flashes).
1. Unit not properly grounded. 1. Check tightness of ground wires at the blower and
ground screws in the electrical control enclosure.
2. Oxidation/corrosion on the flame rod. 2. Sand off oxidation/corrosion.
3. Flame rod not sensing flame. 3. Replace the flame rod. Flame rod grounded.
4. Low gas flow. 4. See symptom #13 of the Troubleshooting Guide.
10. Burner will not light (three (3) flashes).
1. No fuel to heater. 1. Check gas supply. Check all manual shut off cocks in the
supply line.
2. Low gas flow. 2. See symptom #13 of the Troubleshooting Guide.
3. Ignitor does not light burner. 3. See symptom #11 of the Troubleshooting Guide.
4. Automatic gas valve not opening. 4. See symptom #12 of the Troubleshooting Guide.
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