American Standard VAPORSHIELD Residential 30 Operating, Installation And Service Manual page 25

PROBLEM
SLOW HOT WATER RECOVERY
DRIP FROM RELIEF VALVE
THERMOSTAT FAILS TO SHUT
OFF
COMBUSTION ODORS
SMOKING AND CARBON
FORMATION (SOOTING)
CONDENSATION
FLAME BURNS AT ORIFICE
PILOT FLAME TOO SMALL
EXCESIVE RUNIBLING NOISE
ON IGNITION
RUMBLING NOISE AND SHUT
DOWN WITH BURNERS
GOING OUT
TROUBLESHOOTING CHART
POSSIBLE CAUSE (S)
2. Flue clogged
3. Low gas pressure
4. Improper calibration
5. Thermostat set too low
6. Water heater too small
7. Wrong piping connections
8. Wasted hot water
2. Heater stacking
3. Closed water system
I. Defective thermostat
2. Improper calibration
2. Flue clogged
2. Low gas pressure
3. Flue clogged
4. Defective thermostat
I. Temperature setting too low
2. Defective thermostat
3. Low gas pressure
2. Low gas pressure
I. Pilot air intake screen blocked
I. Pilot air intake screen blocked
CORRECTIVE ACTION
3. Check with gas utility company
4. Replace thermostat
5. Turn temperature dial to desired setting
6. Install adequate heater
7. Correct piping-dip tube must be in cold inlet
8. Advise customer
I. Use a pressure reducing valve and relief valve
2. Lower the thermostat setting
1. Replace thermostat
2. Replace thermostat
2. Clean, locate source and correct
3. Provide fresh air ventilation
2. Check with gas utility company
3. Clean, locate source and correct
4. Replace thermostat
5. Provide fresh air ventilation
6. See "Burner Flame" not red on entire surface
I. Increase the temperature setting
2. Replace thermostat
3. Check with gas utility company
I. Clean, locate source and correct
2. Check with gas utility company
I. Clean intake screen
2. Protect unit from dust and dirt
I. Clean intake screen
2. Protect unit from dust and dirt
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