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26
HEATING/BURNER SYSTEM – NATURAL GAS OR LIQUID PROPANE FIRED
Problem Probable Cause Remedy
Discharge water
temperature not reaching
maximum operating
temperature
Worn spray nozzle Replace spray nozzle with
proper size
Gas pressure too low Increase gas pressure or
install additional jets
Draft under burner manifold Prevent down draft with
installation of down draft
diverter. Prevent side draft
with nonflammable barrier
Soot Buildup on coil Clean coil
Hard water (Scale) deposits
in coil
Descale or replace coil
Burner continues to fire
even when water is not
being sprayed
Faulty Flow switch, VAC
Switch or Pressure switch
Replace
Main gas valve stuck open Replace main gas valve
Valve has had water
sprayed on it. Has been
submerged in water and
does not work
Flood or accidental spraying Replace valve: Do not
attempt to repair or clean out
Ignition module has been
subjected to water or
moisture
Flood or accidental spraying Replace module: Do not
attempt to repair
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