John Wood Electric Water Heaters - NEW - Manual (Page 20)

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These guidelines should be utilized by a qualifi ed service agent.
TROUBLESHOOTING GUIDELINES
Problem Possible Cause(s) Corrective Action
WATER LEAKS
(See Leakage Checkpoints on page 19)
Improperly sealed, hot or cold supply connection,
relief valve or drain valve. Seal and tighten threaded connections.
Leakage from other appliances or water lines. Inspect other appliances near water heater.
NO HOT WATER No power to heater. Turn on electrical switch. Check for blown fuses
or tripped breaker.
Non-functioning upper element. Replace element.
High Temperature Limit Switch open. Reset. Check for source of trouble and correct.
Non-functioning upper thermostat. Replace thermostat.
INSUFFICIENT HOT WATER Non-functioning thermostats. Replace thermostats.
Non-functioning lower element. Replace element.
Improper calibration. Replace thermostats.
Thermostats set too low. Set thermostats to desired temperature.
Sediment or lime in tank. Drain. Determine if water treatment is needed.
Heater too small for job. Install water heater of adequate capacity.
Wrong piping connections. Correct piping.
Leaking faucets. Repair faucets.
Wasted hot water. Review and reduce hot water consumption.
Long runs of exposed pipe. Insulate piping.
Hot water piping on outside wall. Insulate piping.
HIGH OPERATION COSTS Improper Calibration. Replace thermostats.
Thermostats set too high. Set thermostat to desired setting.
Sediment or lime in tank. Drain. Flush-Provide water treatment if needed.
Heater too small for job. Install water heater of adequate capacity.
Wrong piping connections. Correct piping.
Leaking faucets. Repair faucets.
Wasted hot water. Review and reduce hot water consumption.
Long runs of exposed piping. Insulate piping.
Hot water piping in exposed wall. Insulate piping.
SLOW HOT WATER RECOVERY Non-functioning upper element. Replace element.
Non-functioning lower element. Replace element.
DRIP FROM RELIEF VALVE Excessive water pressure. Use Pressure Reducing Valve and Pressure
Relief Valve.
Closed system. See “Thermal Expansion” in the For Your Infor-
mation section.
THERMOSTAT DOES NOT SHUT OFF Non-functioning thermostats. Replace thermostats.
Improper calibration. Replace thermostats.
WATER ODOR Sulfi des in the water. See “Operational Conditions” in the For Your
Information section.
WATER HEATER SOUNDS Scale accumulation on elements. Contact dealer to clean or replace elements.