12. Troubleshooting Guide
PNEG-308 Purafire 43
Possible Cause Corrective Action
11. Ignitor does not light burner (three (3) flashes).
1. High-Limit open. 1. See symptom #8 of the Troubleshooting Guide.
2. Low voltage to ignitor. 2. Check 24 volt power output to transformer across terminals 3
and 4 of terminal block. If meter reading is below 24 volts, see
symptom #4 (1) of Troubleshooting Guide. If transformer
output is zero, but voltage at terminals 1 and 2 of terminal
block is of line voltage, replace transformer.
3. Flame safeguard relay module (FSR) malfunction. 3. Check output voltage from terminal #5 (FSR) during trial for
ignition to ensure voltage exceeds 24 volts. If not, replace
FSR module.
4. Low gas flow. 4. See symptom #13 of the Troubleshooting Guide.
5. Ignitor misaligned. 5. Check mounting of ignitor to ensure it is secure.
6. Ignitor malfunction. 6. Replace ignitor.
12. Automatic gas valve not opening (three (3) flashes).
1. High-Limit open. 1. See symptom #8 of the Troubleshooting Guide.
2. Flame safeguard relay module (FSR) malfunction. 2. Check voltage output terminal #8 (FSR) during trial for
ignition to ensure voltage exceeds 24 volts. If not, replace
FSR module.
3. Dirt or sediment in automatic gas valve. 3. Clean and replace all gas supply lines and install a sediment
trap at the heater’s gas inlet. ALL AUTOMATIC GAS VALVES
INSTALLED ON CONTAMINATED SUPPLY LINES
WITHOUT SEDIMENT TRAPS MUST BE REPLACED.
4. Loose or broken wire. 4. Repair or replace wire.
5. Gas valve malfunction. 5. Replace ignitor.
6. Ignition malfunction. 6. Replace ignitor.
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