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Page 57
Problem Probable Cause Remedy
ReplaceFaulty cam switch
Igniter not working Test for spark. Test for
continuity between ignition
wire and ground
WARNING: High voltage
igniter can cause electrical
shock!
Pilot will not light,
burner will not re,
cont.
If no vAC @ valve, replace
module. If you get voltage,
replace the valve.
Check for 24vAC between
main valve (MV) and PV/MV
Pilot lights, but burner
will not re
Check for continuity between
ignition cable and ground wire
Assure good ground
Replace moduleFaulty ignition module
Protect from windy
conditions
Excess draft
Burner res, but goes
out
Turn gas o, call gas
supplier
Gas leak ahead of valve
Replace moduleLockout not working
Turn main gas valve o.
Replace the valve
Valve stuck
NG or LP odor is present
Warning: Check all gas
connections with soap
solution before operation.
ReplaceFaulty thermostat
Clean or replace spray
nozzle, descale coil,
remove obstructions
Water restriction
Incoming gas pressure too high
Lower gas pressure
Discharge water
temperature too high
Replace spray nozzle with
proper size
Worn spray nozzle
Increase gas pressure or
install additional jets
Gas pressure too low
Prevent down draft with
installation of d+own draft
diverter. Prevent side draft
with nonammable barrier
Draft under burner manifold
Clean coilSoot buildup on coil
Hard water (scale) deposits in
coil
Descale or replace coil
Discharge water
temperature not
reaching maximum
operating temperature
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