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FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK
FPS 75 SERVICE AND OPERATION cant.
MAIN BURNER PROBLEMS
Trouble-
shooting cont.
The following are possible causes of main burner problems:
1. Unlevel burner will cause yellow flames.
2. Burning at the orifice indicates main gas valve may not be fully
closing.
3. Incorrect gas pressure; it should be 3.5" for natural gas and 10"
for propane.
4. Soot build-up. Check gas pressure and air flow through heater and
venting.