Rinnai Circ-Logic RU80e, Service Manual

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Condensing Water Heater Service Manual 9
100000354
WARNING
Failure to correctly assemble the components according to the instructions contained within this service manual
may result in a gas leak or explosion.
WARNING
Inspect all gaskets/packings for signs of damage or corrosion. Gaskets/packings found to contain damage or that
appear questionable MUST BE REPLACED. Failure to replace damaged or questionable gaskets may result in
gas leak or explosion.
WARNING
Follow the steps below prior to servicing or replacing any component within the tankless water heater in order to
protect yourself from harm:

Turn off the electrical power supply by unplugging the power cord or by turning off the electricity at the circuit
breaker. (The temperature controller does not control the electrical power.)

Turn off the gas at the manual gas valve, usually located immediately below the water heater.

Turn off the incoming water supply. This can be done at the isolation valve immediately below the water heater or
by turning off the water supply to the building.
DO NOT proceed in performing any electrical
diagnostics, service repairs, or component replacements
without reading and following the warnings below.
STOP
DO NOT proceed in performing any electrical
diagnostics, service repairs, or component replacements
without reading and following the warnings below.
There are a number of (live) tests that are required when fault finding this product. Extreme care should be used
at all times to avoid contact with energized components inside the water heater. Only trained and qualified service
technicians should attempt to repair this product. Before checking for resistance readings, disconnect the power
source to the unit and isolate the item from the circuit (unplug it)
Important Safety Notes