Service Handbook - AO Smith Water Heaters

Overview
Control System Operation
This section of the manual provides instructions and information on Control System features, navigation,
menus, and user settings. See Control System Hardware on page 37 for information concerning the Control
System hardware and components.
The water heaters covered in this manual are equipped with an electronic Control System that controls all
water heater functions.
Control System Features
• Control System Navigation: Plain English text in all Control System menus and intuitive user interface
allows users to quickly find user settings, operational and diagnostic information.
• iCOMM Compatible: These water heaters are compatible with the iCOMM remote monitoring
system. The iCOMM system hardware and monitoring service is purchased separately. It allows
users to monitor critical operational, diagnostic and energy usage data from a secure web site.
The iCOMM system can automatically notify selected personnel via email and/or cellular phone text
messages if Fault conditions, operational problems or user defined Alert Conditions occur. For more
information call 888 928-3702.
• Displays Service Company Contact Info: There is a discreet menu that allows service providers to
enter in their company name and phone number that will appear with all fault conditions displayed on
the Control System's LCD when their are operational problems, see Service Contact Information on
page 53.
• Animated Status Icons: The Control System displays animated Status Icons on the LCD that indicate
when each critical step in the Sequence Of Operation occurs. Service providers can quickly see at
which step in the sequence the problem is occurring in real time, see Desktop Screen on page 46 and
Status Icons on page 47. Also see the written Sequence Of Operation on page 54 and the Sequence Of
Operation Flow Chart on page 55.
• Advanced Diagnostics: Plain English text based diagnostic information (fault messages) on board
to help equipment owners accurately describe the reason for a given lock out condition and service
technicians quickly and accurately service the water heater.
• Fault History Screen: Will retain a 9 event history of fault messages with a time stamp. This will help
diagnose load and/or environmental conditions that may be contributing to a problem with operation or a
lock-out.
• Fault Occurrence Screen: Will keep a running total of how many times each lock out/fault condition
has occurred since the water heater was first installed. This is valuable information for a service
technician when trying to determine root causes for service problems.
• Help Screens: Text based operational information to help the user understand how to change settings,
navigate the menu screens and what the various icons and displayed items mean.
• EMI / RFI Filtering: Built into all Control System circuit boards. (EMI = Electro Magnetic Interference,
RFI = Radio Frequency Interference) Helps prevent or eliminate erratic operation caused by EMI/RFI.
Servicing should only be performed by a Qualified Service Agent
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