4
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.
5. Pilot electrode not sparking to pilot.
6. Piezo igniter not functioning.
1. Combination thermostat/gas valve
set too low for desired water temp.
2. Combination thermostat/gas valve
temperature is satisfied.
3. Insufficient gas supply or low gas
pressure.
4. Combination thermostat/gas valve
has wide differential or is out of
calibration.
1. Insufficient combustion air supply.
2. Incorrect, clogged vent system/ vent
terminal or location.
3. Inconsistent gas supply or gas
pressure.
1. Combination thermostat/gas valve
set too low for desired water temp.
2. Cold inlet water temp. is very cold.
3. High demand periods.
4. Incorrectly sized water heater for
application.
5. Combination thermostat/gas valve is
out of calibration/not functioning.
6. Out of spec dip tube is diluting hot
water with cold water.
1. Poor thermocouple connection at
combination thermostat/gas valve.
2. Thermocouple not fully engaged in
pilot assembly bracket.
3. Pilot flame is not fully enveloping the
thermocouple “hot” junction.
4. Weak or defective thermocouple.
5. Open ECO on combination
thermostat/gas valve.
6. Defective magnet in combination
thermostat/gas valve.
7. Resettable thermal switch has
opened.
1. Turn on gas supply and/or check line pressure.
2. Review lighting instruction.
Set combination/thermostat gas valve to correct
position.
3. Review lighting instruction. Fully depress pilot
lighting button.
4. Clean, repair or replace.
5. Verify correct electrode position.
Replace pilot assembly.
6. Replace Piezo igniter.
1. See Service Procedure
RG-V, Page 12.
4. See Service Procedure
RG-III, Page 10.
5. See Service Procedure
RG-III, Page 10.
6. See Service Procedure
RG-IV, Page 11.
2. See Installation
& operation manual.
3. See Service Procedure
RG-V, Page 12.
4. See Service Procedure
RG-V, Page 12.
1. See Service Procedure
RG-VIII, Page 22.
3. See Service Procedure
RG-V, Page 12.
5. See Service Procedure
RG-V, Page 12
6. See Service Procedure
RG-IX, Page 23
4. See Service Procedure
RG-II, Page 8.
5. See ServiceProcedure
RG-V, Page 13.
6. See Service Procedure
RG-V, Page 13.
1. Adjust temperature dial on combination
thermostat/gas valve.
2. Check temperature dial setting on combination
thermostat/gas valve.
3. Check gas supply and line pressure.
4. Check combination thermostat/gas valve for
proper operation, replace if necessary.
1. Verify adequate combustion air is available to the
unit. Check and clear Jacket slot openings of any
dirt, dust, restrictions or other obstructions.
Inspect flame arrestor plate and clean with stiff
bristled brush and/or vacuum to remove any
debris accumulation.
2. Check venting for proper sizing and proper
operation
3. Check gas supply and line pressure.
1. Check dial on combination thermostat/gas valve.
2. Extremely cold water going into the heater will
decrease the amount of hot water produced.
It may be necessary to temper incoming water
supply.
3. Adjust high demand usage.
4. Contact Plumbing professional.
5. Check combination thermostat/gas valve for
proper operation, replace if necessary.
6. Inspect dip tube and replace if necessary.
1. Check connection at combination thermostat/gas
valve. Proper tightness should be finger tight
plus 1/4 turn.
2. Inspect thermocouple to ensure that it is fully
engaged into pilot bracket.
3. Adjust tip of thermocouple to be fully engulfed
by pilot flame.
4. Check thermocouple and replace if necessary.
5. Check ECO continuity and replace combination
thermostat/gas valve if necessary.
6. Check magnet operation and replace
combination thermostat/gas valve if necessary.
7. Determine cause of switch activation. To reset,
depress button on resettable thermal switch
located on inner door.