Rinnai FC510N User Manual page 19

Warnings
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 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).
Follow the steps below prior to servicing or replacing any components within the 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
product's on/off switch does not control the electrical power).
• Turn off the gas at the manual gas valve, usually located behind the unit or within six foot of the appliance.