A.O. Smith 110 Troubleshooting Manual - 2. Introduction
Troubleshooting Guide
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2. INTRODUCTION
This manual provides the necessary information for troubleshooting the 110 (T‐KJr2), 310 (T‐K4), 510 (T‐
D2) tankless water heaters. It will be effective in helping your troubleshooting needs as long as the
instructions are followed in the intended order. Here is how to use this manual:
• First refer to the Installation Manual as the primary source of information. Refer to it along side
this manual throughout the troubleshooting process.
• Before troubleshooting, if you are unfamiliar with how a tankless unit operates, read the Normal
Operation section (p. 5).
• To double‐check/troubleshoot a new installation, use the Proper Installation section (p. 6).
• When beginning troubleshooting, first go through the Preliminary Checklist (p. 7); it is designed
to fix the most common and frequent problems, and provide you with background information
to help narrow down the information you need.
• After the Preliminary Checklist, move to the Error Codes section (p. 12) if you have received an
error code, or to General Problems (p. 8) if you have not received an error code.
If you have any problems or questions regarding this equipment, or at any point become confused or
uncomfortable with any of the procedures, consult with the technical service department or service
agent.
IMPORTANT
•
Installation and service must be performed by a qualified installer (for
example, a licensed plumber or gas fitter). Otherwise the warranty will
be void.
• The installer/service agent (licensed professional) is responsible for
correctly installing or servicing your water heater and for compliance
with all national, state/provincial, and local codes.
*
For all units installed in the state of Massachusetts, it is required that the installer either be a
licensed plumber or licensed gas fitter.
GENERAL INSTALLATION GUIDELINES
1.
Follow all local codes, or in the absence of local codes, follow the most recent edition of the
National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or CAN/CSA B149.1 Natural Gas, Propane
Installation Code in Canada.
2.
Properly ground the unit in accordance with all local codes or in the absence of local codes, with
the National Electrical Codes: ANSI/NFPA 70 in the USA or CSA standard C22.1 Canada Electrical
Code Part 1 in Canada.
3.
Carefully plan where you intend to install your water heater.
4.
Check the rating plate for the correctGAS TYPE, GAS PRESSURE, WATER
PRESSURE and ELECTRIC RATING.
*If this unit does not match your requirements, do not install.
5.
If any problem should occur, turn off all hot water taps and turn off the
gas. Then call a trained technician or the gas company.
WARNING
RATING
PLATE
Figure 1