Troubleshooting Checklist; Checklist; Replacement Parts; Leakage Checkpoints - A.O. Smith 52 Instruction Manual

Commercial electric water heaters
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OTHER SCALE REMOVAL:
1. Flush cleaned ends of elements with water when deliming
or cleaning is completed.
2. Remove sediment and scale from the tank bottom through
the access provided by the element openings or drain valve
opening.
The cold water inlet valve and drain valve may be opened
to aid the cleanout process.
3. Clean remaining gasket material from tank and element
flanges Do not reuse original element gaskets.

CHECKLIST

Before calling for service, check the following points to see if
the cause of trouble can be identified and corrected.
Reviewing this checklist may eliminate the need of a service
call and quickly restore hot water service. See Figure 2 and
Figure 3. Surface Mount Control Models in this manual to
identify and locate water heater components.
NOT ENOUGH OR NO HOT WATER
1. Be certain the electrical disconnect switch serving the water
heater is in the ON position.
2. Check the fuses.
• The electrical disconnect switch usually contains fuses.
• The heater has fusing.
3. If the water was excessively hot, and is now cold, the high
limit switch may have activated.
• See the Temperature Regulation section of this manual
for more information on how to reset the ECO high
limit controls.
4. The capacity of the heater may have been exceeded by a
large demand for hot water.
• Large demands require a recovery period to restore
water temperature.
5. Cooler incoming water temperature will lengthen the time
required to heat water to the desired temperature.
6. Look for hot water leakage.
7. Sediment or pipe scale may be affecting water heater
operation.
ABNORMAL SOUNDS
1. Sediment or lime scale accumulations on the elements
causes sizzling and hissing noises when the heater is
operating.

TROUBLESHOOTING CHECKLIST

37
4. Put new gaskets on each element and install into tank
openings.
5. Attach element wires to connection points from which they
were removed.
6. Follow FILLING instructions to restore hot water service.
• Check for water leaks around elements and proper
operation when heater is filled.
• Close the front panel.
• The sounds are normal, however, the tank bottom and
elements should be cleaned. See the Maintenance
section o f this manual.
2. Some of the electrical components of the water heater make
sounds which are normal.
• Contactors will "click" or snap as the heater starts and
stops.
• Transformers and contacts often hum.
Water leakage is suspected.
Refer to Leakage Checkpoint on the following page.
1. Check to see if the heater drain valve is tightly closed.
2. If the outlet of the relief valve is leaking it may represent:
• Excessive water temperature.
• Faulty relief valve.
• Excessive water pressure.
3. Excessive water pressure is the most common cause of
relief valve leakage. It is often caused by a "closed system".
See "Closed Water Systems" and "Thermal Expansion" in
the Installation section of this manual for more information.
4. Examine the area around the element for gasket leakage.
• Tighten the elements or, if necessary, follow the WATER
AND LIME SCALE REMOVAL procedure to replace the
gaskets.
IF YOU CANNOT IDENTIFY OR CORRECT THE SOURCE OF
MALFUNCTION
1. Turn the power supply to the water heater off.
2. Close the supply water inlet valve to the heater.
3. Contact a Qualified Service Agency in your area.

REPLACEMENT PARTS

Call the toll free phone number listed on the warranty sheet of
this Instruction Manual for assistance in locating replacement
parts. When ordering parts, specify complete model no., serial
no., (see rating plate), quantity and name of part desired.
Standard hardware items should be purchased locally.

LEAKAGE CHECKPOINTS

INSTRUCTIONS: USE THIS ILLUSTRATION AS A GUIDE
WHEN CHECKING FOR SOURCES OF WATER LEAKAGE.

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