Gas Water Heater Not Working: Common Problems

Common Gas Water Heater Problems and Solutions

  1. No hot water
  2. Not enough hot water or water not hot enough
  3. Water too hot
  4. Relief valve leaks continuously
  5. Relief valve leaks and hot water has not been used
  6. Relief valve drips after heavy use of hot water
  7. Drain valve leaks
  8. Cold water supply valve leaks
  9. Water pipes leak
  10. Hot water rusty
  11. Hot water smells bad
  12. Water heater rumbling
  13. Water heater sizzles
  14. Water heater noisy
  15. Hot water or tank sooty

No hot water

Possible CauseProcedure
Pilot light outRelight pilot light
Pilot light does not stay litReplace thermocouple
Repeated pilot outagesCheck for floor drafts,
check and clean flue and vent
Temperature control turned offReset temperature control
Temperature control faultyCall for service

Not enough hot water or water not hot enough

Possible CauseProcedure
Heavy household demand for hot waterStagger use of hot water or have a larger
water heater installed
temperature control set too lowRaise temperature control settings
Poor burner flame slows recovery timeCheck and clean flue and vent
Sediment in tank slows heater recovery timeDrain and refill tank
If rate of sedimentation is high, have water
softener installed
Hot water faucet leaksRepair faucet
Loss of heatInsulate tank and hot water pipes
Incoming water too coldRaise temperature control settings
Dip tube brokenCall for service

Water too hot

Possible CauseProcedure
Temperature control set too high or
frequent short draws of hot water cause buildup
of very hot water in to of tank
Lower temperature control settings
Temperature control faultyCall for service

Relief valve leaks continuously

Possible CauseProcedure
Relief valve faultyTest and replace valve
If pressure reducing valve in system, call for service

Relief valve leaks and hot water has not been used

Possible CauseProcedure
Excessive pressure in supply waterLower temperature control settings
Have pressure reducing valve installed

Relief valve drips after heavy use of hot water

Possible CauseProcedure
Water at top of tank too hotStagger hot water use or lower temperature
Test and replace valve

Drain valve leaks

Possible CauseProcedure
Valve loose or faultyTighten valve handle
Replace washer or valve

Cold water supply valve leaks

Possible CauseProcedure
Valve faultyReplace valve

Water pipes leak

Possible CauseProcedure
Pipes broken or corrodedHave pipes replaced

Hot water rusty

Possible CauseProcedure
Water heater tank corrodedDrain and refill tank
Check and replace anode rod
Lower temperature control settings
Have water heater replaced
Galvanized steel water pipes corrodedHave pipes replaced

Hot water smells bad

Possible CauseProcedure
Magnesium anode rod reacting with sulfurous hot waterReplace with aluminum anode rod
Have water heater replced

Water heater rumbling

Possible CauseProcedure
Sediment in tank traps pockets of very hot waterDrain and refill tank regurarly
Have water softener installed if sedimentation rate is high

Water heater sizzles

Possible CauseProcedure
Water leaks into burner chamberHave water heater replaced

Water heater noisy

Possible CauseProcedure
Burner pops when heater turns on or offHave gas company check burner and gas pressure
Noisy combustion from burnerEliminate any strong floor drafts
If problem persists, have burner and gas pressure checked

Hot water or tank sooty

Possible CauseProcedure
Improper ventilationCheck and clean flue and vent
If problem persists, have burner and gas pressure checked

Leave a Comment

Call for a Quote