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PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION
WATER LEAKS
1. Improperly sealed, hot or cold supply
connections, relief valve, drain valve or
thermostat threads.
2. Leakage from other appliances or
water lines.
3. Condensation of flue products.
4. Excessive water pressure.
5. Heater stacking.
6. Closed water system.
1. Tighten threaded connections.
2. Inspect other appliances near water heater.
3. See “START UP CONDITIONS”, section.
4. Use a pressure reducing valve and relief valve.
5. Lower the thermostat setting.
6. See “Closed System/Thermal Expansion”.
LEAKING T&P
1. Thermal expansion in closed water
system.
2. Improperly seated valve.
1. Install thermal expansion tank (DO NOT plug T&P
valve).
2. Check relief valve for proper operation (DO NOT
plug T&P valve.
HOT WATER ODORS
1. High sulfate or mineral content in water
supply.
2. Bacteria in water supply.
1. Drain and flushing heater thoroughly then refill.
2. Chlorinate water supply.
WATER HEATER SOUNDS
SIZZLING-RUMBLING
1. Condensation dripping on burner.
2. Sediment at bottom of heater tank.
1. See “START UP CONDITIONS”, section.
2. See “DRAINING AND FLUSHING”, section.
SMOKING AND CARBON
FORMATION (SOOTING)
1. Insufficient secondary air.
2. Low gas pressure.
3. Water heater flue or vent system
blocked.
4. Thermostat not functioning properly.
5. Heater installed in a confined area.
6. Burner flame yellow-lazy.
1. Provide ventilation to water heater. Check flue way,
flue baffle, burner.
2. Check with gas utility company.
3. Clean, locate source and correct.
4. Replace thermostat.
5. Provide fresh air ventilation.
6. See “Burner Flame Yellow-Lazy”.
HIGH OPERATION COSTS
1. Thermostat set too high.
2. Sediment or lime in tank.
3. Water heater too small for job.
4. Wrong piping connections.
5. Leaking faucets.
6. Gas leaks.
7. Wasted hot water.
8. Long runs of exposed piping.
9. Hot water piping in exposed wall.
1. Set temperature to lower setting.
2. Drain/flush-provide water treatment if needed.
3. Install adequate heater.
4. Correct piping-dip tube must be in cold inlet.
5. Repair faucets.
6. Check with utility-repair at once.
7. Advise customer.
8. Insulate piping.
9. Insulate piping.
THERMOSTAT FAILS TO
SHUT-OFF
1. Thermostat not functioning properly.
2. Improper calibration.
1. Replace thermostat.
2. Replace thermostat.
DRIP FROM RELIEF VALVE
1. Excessive water pressure.
2. Heater stacking.
3. Closed water system.
1. Use a pressure reducing valve and relief valve.
2. Lower the thermostat setting.
3. See “CLOSED SYSTEM/THERMAL EXPAN-
SION”, section.
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