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The Control System performs exhaustive self diagnostics and displays detected fault conditions in plain
English fault messages on the lCD when there is a problem. When the Control System declares a fault
condition it will "lock out" and disable heating.
Troubleshooting procedures for the most common fault conditions are covered in this manual. In the tables
that follow the first column will show a list of things to check and repair for a given problem or fault condition.
The second column will show the fault message as displayed on the lCD along with an explanation.
rough starting/rough operation
• Ensure the correct type of fuel gas, natural gas or propane, is supplied to the water heater, see the
water heater's rating label.
• Check supply gas and manifold offset pressures, see Gas Pressure Test on page 26.
• Ensure the correct gas orifice is installed, see Gas Valve Removal on page 24.
• Inspect the Burner for debris or damage - see Combustion Blower and Burner Removal on page 14.
not enough hot water
• The heating capacity of the water heater has been exceeded.
• Hot water supply valve(s) to fixtures not fully open.
• Operating Set Point is too low and/or Differential setting is too high. See Operating Set Point And
Differential Adjustment on page 49.
• Tank Probe Offset setting too high, see Temperatures Menu on page 50.
• Inlet/outlet water piping connections to water heater reversed.
• Dip tube inside water inlet connection missing.
heater status menu
This Control System menu shows the current state (energized/de-energized) of the Combustion Blower, Igniter
and 24 Volt Gas Valve. The state (open/closed) of the contacts for the Blower Prover, Blocked Intake Air and
Blocked Exhaust switches. This information is displayed in real time. Use this menu when troubleshooting to
quickly and accurately diagnose operational problems.
things to CheCK before serviCing
• Using the Instruction Manual that came with the water heater as reference, verify the water piping, gas
line, venting and electrical have all been properly installed.
• Ensure the power supply to the water heater is polarity is correct and the water heater is properly
grounded, see Electrical Requirements on page 6.
• Ensure supply gas pressure is within the minimum and maximum requirements, see Table 2 on page 25.
• Review the Installation Considerations on page 3 and the Installation Check list on page 7.
note: Poor installations account for many service problems. Costs to correct installation errors are not
covered under the limited warranty.
resetting the Control system
To reset the Control System from a lock out/fault condition; turn the power supply off for approximately 20
seconds and then back on. Keep in mind if the condition that caused the lock out has not been corrected the
Control System will continue to lock out.
important 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.
56
troubleshooting
Servicing should only be performed by a Qualified Service Agent
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