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This Service Manual covers the water heater Model and Series numbers listed on the front cover only. The
instructions and illustrations contained in this manual will provide you with troubleshooting procedures to
verify proper operation and diagnose and repair common service problems.
Qualifications
Qualified installer or service agency
Installation and service of this water heater requires ability equivalent to that of a Qualified Agency (as defined
by AnSI below) in the field involved. Installation skills such as plumbing, air supply, venting, gas supply and
electrical supply are required in addition to electrical testing skills when performing service.
ansi Z223.1 2006 sec. 3.3.83: "Qualified Agency" - "Any individual, firm, corporation or company that either
in person or through a representative is engaged in and is responsible for (a) the installation, testing or
replacement of gas piping or (b) the connection, installation, testing, repair or servicing of appliances and
equipment; that is experienced in such work; that is familiar with all precautions required; and that has
complied with all the requirements of the authority having jurisdiction."
service warning
If you are not qualified (as defined by AnSI above) and licensed or certified as required by the authority
having jurisdiction to perform a given task do not attempt to perform any of the procedures described in
this manual. If you do not understand the instructions given in this manual do not attempt to perform any
procedures outlined in this manual.
service reminder
When performing any troubleshooting step outlined in this manual always consider the wiring and connectors
between components. Perform a close visual inspection of all wiring and connectors to and from a given
component before replacement. Ensure wires were stripped before being crimped in a wire connector, ensure
wires are crimped tightly in their connectors, ensure connection pins in sockets and plugs are not damaged
or worn, ensure plugs and sockets are mating properly and providing good contact.
Failure to perform this critical step or failing to perform this step thoroughly often results in needless down
time, unnecessary parts replacement, and customer dissatisfaction.
tools reQuired
• Instruction Manual that came with the water heater.
• All tools common to installation and service of commercial water heaters such as hand tools, torch, pipe
wrenches etc.
• Long (8-10") T handle 1/8 inch hex (allen key) wrench for Combustion Blower removal and installation.
• Hex (Allen) wrench sizes: 5/32", 1/8", 1/4" and 5/16" - for Burner, and 24 Volt Gas Valve removal and
installation.
• Two digital manometers: Range -20.00 to +20.00" W.C. Resolution - 0.01" W.C. Recommend uEI model
EM200 or equivalent. Required to test pressure switch performance. Also used to measure supply and
manifold gas pressures.
• digital Multi Meter; Fieldpiece HS36, Fluke 187, uEI dL289 or equivalent capable of measuring:
• AC/dC Voltage.
• ohms.
• dC micro amps (μA) - flame sensing current, see Flame Sensing Current Test on page 19.
• AC amp meter- recommend uEI model dL289 or equivalent.
• 120 VAC plug in outlet tester, see Figure 2 on page 6
2
introduction
Servicing should only be performed by a Qualified Service Agent
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