John Wood Direct Vent - Manuel (Page 41)

www. johnwoodwaterheaters .com 41
PROBLEM POSSIBLE CAUSE(S) CORRECTION
INSUFFICIENT HOT
WATER
1. Thermostat set too low
2. Sediment or lime in tank
3. Water heater too small
4. Wrong piping connections
5. Leaking faucets
6. Wasted hot water
7. Long runs of exposed piping
8. Hot water piping in outside wall
9. Low gas pressure
10. Leaks or cracks in dip tube
11. Incorrect plumbing/plumbing crossover 1. Turn temperature dial to desired setting
2. Drain/flush-provide water treatment if
needed
3. Install adequate size heater
4. Correct piping-dip tube must be in cold
inlet
5. Repair faucets
6. Advise customer
7. Insulate piping
8. Insulate piping
9. Check with gas utility company
10. Check dip tube. Replace if faulty
11. Correct cold water crossover
SLOW HOT WATER
RECOVERY
1. Insufficient combustion air
2. Venting/flue clogged
3. Low gas pressure
4. Improper calibration
5. Gas control/thermostat set too low
6. Water heater too small
7. Wrong piping connections
8. Wasted hot water
9. Sediment or lime in tank 1. Check vent termination hood and
venting, flueway, flue baffle and burner
2. Clean flue, locate source and correct
3. Check with gas utility company
4. Replace gas control/thermostat
5. Turn temperature dial to desired
setting
6. Install adequate size heater
7. Correct piping-dip tube must be in
cold inlet
8. Advise customer
9. Drain/flush - provide water treatment if
needed
DRIP FROM RELIEF
VALVE
1. Excessive water pressure
2. Heater stacking
3. Closed water system/thermal
expansion
1. Use a pressure reducing valve and
relief valve
2. Lower the thermostat setting
3. See “Closed System/Thermal
Expansion”
THERMOSTAT FAILS TO
SHUT OFF
1. Defective gas control/thermostat
2. Improper calibration 1. Replace gas control/thermostat
2. Replace gas control/thermostat
COMBUSTION ODOURS
1. Insufficient ventilation air
2. Flue clogged or vent system blocked
3. Heater installed in a confined area 1. Provide ventilation to the water heater.
Check flueway, flue baffle, burner
2. Clean, locate source and correct
3. Provide fresh air ventilation
SMOKING AND CARBON
FORMATION (SOOTING)
1. Insufficient combustion air
2. Low gas pressure
3. Venting/flue clogged
4. Defective gas control/thermostat
5. Burner flame yellow-lazy 1. Check vent termination hood and
venting, flueway, flue baffle and burner
2. Check with gas utility company
3. Clean, locate source and correct
4. Replace gas control/thermostat
5. See “Burner Flame Yellow-Lazy”
CONDENSATION
1. Temperature setting too low
2. Water heater too small 1. Increase the temperature setting
2. Install adequate size heater
BURNER FLAME
FLOATS AND LIFTS OFF
PORTS
1. Orifice too large
2. High gas pressure
3. Flue clogged 1. Replace with correct orifice
2. Check with gas utility company
3. Clean flue and burner-locate source
and correct
BURNER FLAME TOO
HIGH
1. Orifice too large
2. High gas pressure 1. Replace with correct orifice
2. Check with gas utility company
FLAME BURNS AT
ORIFICE
1. Defective gas control/thermostat
2. Low gas pressure
3. Orifice not properly installed 1. Replace gas control/thermostat
2. Check with gas utility company
3. Reinstall the orifice