Rinnai RUC80i Training Program page 85

General Troubleshooting Summary
this is a general guide and not intended as an official troubleshooting procedure - contact Rinnai technical support if needed.
GAS
Verify incoming pressure
Is there a large drop from between lock up and
load pressure ? This could indicate a
volume/line sizing/regulator/meter issues?,
Were all appliances operating during test?, Has
the gas line been over-pressurized?, Are
altitude adjustments needed?
Verify clean burner area
Is there any condensation debris...why?, signs of leakage....why, Is the flame rod/sparker clean
Verify manifold pressure
If the gas valve was removed, are all solenoids plugged in
correctly?
Confirm the information?
If SERVICE OR INSTALLATION assistance is needed in diagnosing the operation of the product, contact Rinnai technical support at 1-888-RINNAIS
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PROPRIETARY and CONFIDENTIAL
Basic Troubleshooting
AIR
Verify correct venting
Verify correct parts, seals, custom cuts,
termination clearances, internal airways, high
altitude/cold climate adjustments
Verify clean fan
Is the fan sealing correctly?, etc.)
and properly oriented?
(check all harnesses for damage—i.e. water, corrosion, shorts/opens?, etc.)
Is the problem environmental?
Have you witnessed the symptom?, is your meter or manometer connected/setup correctly? Are the meter probes making good contact?
Enhancing Lives By Changing The Way Water Is Heated
:
ELECTRICITY
Verify input power
(Is there adequate power to PCB?, Is
incoming polarity correct? Is there a
sufficient ground?
Verify DC power
Will the unit fire with no controller? Will the
controller light with nothing else plugged into
PCB?, Will the controller light with no extra
thermostat wire?
Verify grounding
(Is the ground good through entire circuit?,
Have any internal wires been shorted to
ground?
Verify all wiring/harnesses
(time of day?, weather?, etc.)
85
WATER
Verify flow
(with unit isolated)
(Is the flow in right direction?, Verify no back flow?,
is the filter/turbine clean?, etc.)
Verify incoming water
temperature
(make sure delta T is adequate, Is flushing needed?,
Are thermistor bulbs clean?, etc.)
Verify pressure/pipe size
Verify application
Could issue be application related (pump
sizing, check valve location/orientation,
etc.)
5/4/2018