Rinnai RUC80i Training Program page 13

Overheat Protection and Safeties
Overheat bi-metal switch(es) are placed at various locations inside the
water heater to monitor for overheat conditions.
1. Overheat switch #1 is attach to a copper pipe on the right just above the
secondary heat exchanger. This switch opens at 207⁰F causing water
heater shut down with a code 14. The switch will close after the unit
cools. The unit must be reset by stopping water flow or turning the unit
OFF then ON a the controller.
2. Burner overheat switches #2 are located at the top, back side of the
burner assembly. There are two switches wired in series. These switches
open at 302⁰F causing water heater shut down with a code 57. These
switches will close after the unit cools but the water heater must be reset
by disconnecting and reapplying electrical power.
3. Secondary Heat Exchanger overheat switches #3 are located on the back
of the secondary heat exchanger on either side of the exhaust duct.
There are two switches wired in series. These switches open at 212⁰F
causing water heater shut down with a code 58. These switches will close
after the unit cools but the water heater must be reset by disconnecting
and reapplying electrical power.
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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
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