Service Manual

7
White Rodgers Mechanical Gas Control Troubleshooting Chart
Flammable Vapor Ignition Resistant Water Heaters
Symptom Probable Cause Corrective Action
Service
Procedure
Pilot goes out
periodically (after
heating cycles,
once a day, once
a week etc.)
1. Insufficient combustion air
supply.
2. Incorrect or clogged vent
system/vent terminal, or
incorrect location.
3. Inconsistent gas supply or
gas pressure.
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 compressed
air to remove any debris
accumulation.
2. Check venting for proper sizing
and proper
operation.
3. Check gas supply and line
pressure.
1. See Service
Procedure RG-
VIII
2. See Service
Procedure RG-V
Not enough hot
water
1. Combination thermostat/gas
valve 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. Combination thermostat/gas
valve is out of calibration/not
functioning.
6. Out of spec dip tube is
diluting hot water with cold
water.
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. See Service
Procedure RG-V
2. See Service
Procedure RG-IX
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