Vulcan freeloader 260 suddenly turns off after heating to temperature. Control unit was just replaced but still doing the same. I was told by another person it is the thermo couple but the fitter said

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http://waterheatertimer.org/How-to-install-electric-water-heater.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/How-to-light-gas-water-heater.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sounds like a relay inside the air handler is stuck 'closed'...

unfortunately there is no fix other than replacing the tank, it has a lot of rust buildup inside over 18 years, which is a very long time for a hot water tank today.

Hello...how old is the unit? Today it is very common for gas appliances to have electric igniters instead of a pilot light. Unless you are familiar with gas controll/regulator valves I would not recommend trying this yourself. I believe it is more likely a faulty or dirty thermo-couple. Again , unless you are familiar with the opperation of gas supplies ,controls ,etc. DO NOT ATTEMP to do this yourself!!! Gas is very dangerous for the less than well informed! Call a service pro or speak to and ask for the assistance of a knowledgable friend.

The manual says:
http://www.coinwash.com/temp/rinnai.pdf

"For the name of the Authorized Distributor or Installer nearest you, please contact your local HVAC dealer or gas service technician, visit the Rinnai website (www.rinnai.us), call Rinnai at1-800-621-9419 or write to Rinnai, 103 International Drive, Peachtree City, Georgia 30269"

Manual says that the remote is for setting temperature.
When you turn on hot water spigot, tankless water heater will heat the water to the set point temperature.
If water heater is not set up to use remote, then tankless unit will heat to 140 degrees F.
"With the MCC-45-4US remote control installed the water temperature is adjustable from 96
to 180°F. The water temperature cannot be set to a temperature other than 140°F
without the use of the MCC-45-4US remote control unit. If you require a temperature
other than 140°F you must install the MCC-45-4US remote control unit."

"Error messages are displayed on the remote control units, simplifying service calls."

Page 9 of manual shows hot to set temperature using remote.
Water taps must be shut off to set temperature.
Circulating pump must be turned off.
"Simply press the H or C button until desired temperature is displayed"
"green in-use indicator will display"

If your unit is not working, the manual says to contact local plumber.
Fixya has specialists who will talk to you by phone about your problem for a fee.

Remove the access panel lower right hand side and locate the pilot light re-igintion push button. The instructions are pritnted on the back of the access panel.

hi i need help with mi Vulcan 300 hot water main gas pressure...
our kitchen tap got broken and we turn off our main water pressure in front off our house and now our hot water gas not working ....please help
thank you ...

Remove the cover and there should be a temp setting