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Troubleshooting Chart
Symptom Probable Cause Corrective Action
Pilot will not light
1. No incoming gas or too low gas
pressure.
2. Gas control knob set to wrong position.
3. Pilot light button not being fully
depressed when attempting to light pilot.
4. Pilot orifice or pilot
tube is obstructed or
kinked.
1. Poor thermocouple connection at
gas control.
2. Thermocouple not fully engaged in pilot
assembly bracket.
3. Pilot flame is not fully enveloping the
thermocouple “hot” junct
ion.
4. Weak or defective thermocouple.
5. Open ECO on gas control.
6. Defective magnet in gas control.
Pilot will not
stay lit
when button is released
Pilot will light, but the
main burner will not
come on
1. Gas Control set too low for desired water
temperature.
2. Gas Control temperature is satisfied.
3. Insufficient gas supply or low gas
pressure.
4. Gas Control has wide differential or is out
of
calibration.
Pilot goes out
periodically (after
heating cycles, once a
day, once a week etc.)
1. Insufficient combustion air supply.
2. Incorrect, clogged vent system/ vent
terminal or location.
3. Inconsistent gas supply or gas pressure.
Not enough hot water
1. Gas Control set too low for desired water
temperature.
2. Cold inlet water temperature is very cold.
3. High demand periods.
4. Incorrectly sized water heater for
application.
5. Gas Control is
out of calibration/not
functioning.
6. Out of spec dip tube is diluting hot water
with cold water.
7. Integrated mixing device is set too low for
desired water temperature.
1. Turn on gas supply and/or check line
pressure.
2. Review lighting instruction. Set
gas control to correct position.
3. Review lighting instruction. Fully depress
pilot lighting button.
4. Clean, rep
air or replace.
1. Check connection at gas control.
Proper tightness should be finger tight plus
¼ turn.
2. Inspect thermocouple to ensure that it is
fully engaged into pilot bracket.
3. Adju
st tip of thermocouple to be fully
engulfed by pilot flame.
4. Check thermocouple and replace if
necessary.
5. Check ECO continuity and replace
gas control if necessary.
6. C
heck magnet operation and replace
gas control if necessary.
1. Adjust tempe rature dial on gas control.
2. Check temperature dial setting on
gas control.
3. Check gas supply and line pressure.
4. Check gas control
for proper operation, replace if
ne
cessary.
1. Verify adequate combustion air is available
to the unit. Check and clear Jacket slot
openings of any dirt, dust, restrictions or
other obstructions.
2. Check venting fo
r proper sizing and proper
operation
3. Check gas supply and line pressure.
1. Check dial on gas control.
2.Extremely cold water going into the water
heater will decrease the a mount of hot
water produced. It may be necessary to
temper incoming water supply.
3. Adjust high demand u
sage.
4. Contact Plumbing professional.
5. Check gas control
for proper operation, replace if
necessary.
6. Inspect dip tube and replace if necessary.
7. Reset device using the procedure
i
n the instructions included with the device.
Service
Procedure
1. See Service Procedure
AG-III, Page 12.
4. See Service Procedure
AG-II, Page 9.
4. See Service Procedure
AG-I, Page 6
5. See Service Procedure
AG-III, Page 12
6. See Service Procedure
AG-III, Page 12
2. See Installation &
operation manual.
3. See Service Procedure
AG-III, Page 12
4. See Service Procedure
AG-III, Page 12
3. See Service Procedure
AG-III, Page 12
5. See Service Procedure
AG-III, Page 12
6. See Service Procedure
AG-V, Page 23
Page 3
For Models Using White Rodgers or Robertshaw Thermostat
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