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Should the main burner or burner air openings require cleaning, remove
the burner and clean with a soft brush. Clean main burner orifice with a
suitable soft material.
CHECK FOR GOOD FLOW OF COMBUSTION AND VENTILATING AIR TO
THE UNIT. MAINTAIN A CLEAR OPEN AREA AROUND THE HEATER AT
ALL TIMES. DO NOT STORE COMBUSTIBLES OR FLAMMABLE LIQUIDS
NEAR OR AROUND AN APPLIANCE.
FIGURE 12 - MAIN BURNER AND IGNITER ASSEMBLY
CONDENSATION
Water vapor can condense on the cooler surfaces of the tank forming
droplets, these drip into the fire or run out on the floor. This is common
at the time of startup after installation, during periods of time when
incoming water is very cold, or the heater may be undersized for the
requirements.
Droplets from the bottom of the flue may be due to corrosive combustion
products or improper vent. Check with your dealer for more information.
CATHODIC PROTECTION-ANODE
The anode rod within the tank is designed to be slowly consumed
cathodically, minimizing corrosion in the glass lined tank. A hydrogen
sulfide (rotten egg) odor may result if water contains high sulfate and/or
minerals. Chlorinating the water supply should minimize the problem.
(See EXTENDED NON-USE PERIODS).
NOTE: Anode must remain installed (except for inspection) to avoid
shortening tank life. See LIMITED WARRANTY. Replace as necessary.
SERVICE AND REPAIR
The A.O. Smith water heater requires no special care other than the
normal maintenance as noted above. If you are having a problem with
your water heater, before calling for service please refer to the following
TROUBLESHOOTING sections. If service becomes necessary, contact
your dealer, installer or an authorized service agent. Do not attempt to
repair the water heater yourself. Any work performed by unauthorized
personnel may void the warranty.
If you are having a problem with your A.O. Smith water heater and are
not pleased with the service you received:
• First, please contact your dealer or the A.O. Smith authorized service
agent in your area and explain to them why you are not satisfied.
This will usually correct the problem.
• If after working with your dealer or service agent the problem has
not been resolved to your satisfaction, please let us know by either
writing to us at:
A.O. Smith Water Products Company
Service Department
600 East John Carpenter Freeway
Rochelle Park, Suite 200
Irving, TX 75038
or, going to our website at: www.hotwater.com
Please click on: "Mail",
then click on: "Service"
and leave us a message.
Please be sure to provide the following information when writing or
e-mailing:
• Model Number
• Serial Number
• Date of Original Purchase
• Date Problem Originated
• Explanation of Problem
Also, please be sure to include a daytime telephone number.
TROUBLE SHOOTING
Water heater may exhibit problems that are unrelated to a malfunction of
the water heater itself. The following information and tables may serve
to answer your question about a problem that you are having without
having to call a service agent.
For your safety, water heater service should be performed only by a
qualified service technician. Read the GENERAL SAFETY INFORMATION
section first.
WATER HEATING CYCLE
(GAS AND ELECTRIC POWER ARE ON, “OFF/ON” SWITCH IS ON)
1) SMARTVALVE
®
(1) CALLS FOR HEAT (SEE FIGURES 7 &12)
A) THERMOSTAT SENSES NEED FOR HEATING WATER
B) CONTACTS CLOSE IN THERMOSTAT, POWER (115 VAC)
FLOWS TO BLOWER MOTOR
2) BLOWER MOTOR ROTATES BLOWER WHEEL
A) BLOWER WHEEL SPEED INCREASES
B) WHEEL SPEED INCREASES, AIR PRESSURE SWITCH
CONTACTS CLOSE
3) 120 VAC FLOWS TO HOT SURFACE IGNITER
NOTE: THE CONTROL MODULE ON THIS UNIT WILL TRY A MAXIMUM OF
THREE TIMES TO LIGHT THE UNIT. CYCLE CAN BE RESTARTED AT ANY
TIME BY TURNING OFF SWITCH AND THEN TURNING BACK ON. IF UNIT
HAS GONE THROUGH THREE CYCLES AND DID NOT LIGHT, THEN
REPAIRMAN SHOULD BE CALLED TO CHECK OPERATION OF HEATER.
4) MAIN BURNER IGNITES
A) GAS FLOWS TO MAIN BURNER PORTS AND IS IGNITED
5) GAS VALVE SENSES BURNER FLAME
6) BURNER HEATS WATER
A) BURNER HEATS WATER TO THERMOSTAT SETTING
B) CONTACTS IN THERMOSTAT OPEN,
C) CYCLE IS COMPLETED
IGNITER MAIN BURNER