VIII) TROUBLESHOOTING GUIDE
Note:
Troubleshooting must be done by qualified service personnel familiar with the start up and check out procedure.
Note:
The latest version of the installation and operating instructions manual can be found at www.johnwoodwater-
heaters.com
– 27 –
PROBLEM
POSSIBLE CAUSE(S)
CORRECTION
BURNER WILL NOT IGNITE
(FOR 24V CONTROLS ONLY)
1. No Power to Unit
2. Thermostat setting too low
3. Defective flue damper
4. Disconnected or loose wire
5. Control lock-out
6. Door-mount temperature cut-off (TCO)
switch was activated.
7. No gas
8. Dirt in the pilot or gas line
9. Plugged pilot or burner orifice
10. Defective gas control valve
11. Defective igniter
12. Heater installed in a confined area
1. Plug in power cord, check fuses/supply
voltage
2. Increase thermostat temperature setting
3. Replace flue damper
4. Repair or reconnect wires
5. Reset-determine cause of lockout.
6. Call a qualified service technician
7. Check with the gas utility company
8. Notify gas utility. (Note: It is highly recom-
mended that a trap is installed in the gas
line.)
9. Clean, locate source and correct
10. Refer to "24 Volt Honeywell Control
Service" section
11. Replace igniter
12. Provide more air ventilation
1. Insufficient secondary air
2. Low gas pressure
3. Flue clogged
4. Main burner line clogged
5. Heater installed in a confined area
6. Obstruction in main burner orifice
1. Provide ventilation to water heater
2. Check with gas utility company
3. Clean, locate source and correct
4. Clean, locate source and correct
5. Proper fresh air ventilation
6. Clean or replace orifice
BURNER FLAME YELLOW-LAZY
PILOT FLAME TOO SMALL
1. Pilot line or orifice clogged
2. Low gas pressure
3. Defective pilot
1. Clean, locate source and correct
2. Check with gas utility company
3. Replace pilot
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
1. Turn temperature dial to desired setting
2. Drain/flush-provide water treatment if need-
ed
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
1. Insufficient secondary air
2. 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
1. Provide ventilation to water heater. Check
flue way, flue baffle and burner
2. Clean flue, locate source and correct
3. Check with gas utility company
4. Refer to "24 Volt Honeywell Control
Service" section
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
SLOW HOT WATER RECOVERY
DRIP FROM RELIEF VALVE
1. Excessive water pressure
2. Heater stacking
3. Closed water system
4. Temperature setting too high
1. Use a pressure reducing valve and expan-
sion tank
2. Lower the thermostat setting
3. See “Closed System/Thermal Expansion”
4. Decrease the temperature setting
INSUFFICIENT HOT WATER
1. Thermostat set too low
2. Hot water piping in outside wall
3. Long runs of exposed piping
4. Mixing valve set too low
1. Turn temperature dial to desired setting
2. Insulate piping
3. Insulate piping
4. Set mixing valve to desired setting.
