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Unit fires up, runs 10-20 seconds then exaust motor makes clankings sound and shuts down. Error code flashes E1 for a few seconds then unit fires back up, repeating cycle. Seems to be plenty of water flow through unit.
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I just went through lots of troubleshooting the same problem. Most searches will tell you its a communication error with the remote. After I was able to rule out the wiring, I bought a new remote ($70), hooked it up and immediately got the same error. Called Rheem Tech Support at 866-720-2076. They said code 76 meant I needed a new control board and chip. My unit was out of warranty but they sent the needed parts and detailed install instructions the same day, via FedEx overnight! It was a very simple task to replace. I happen to own 4 different units and am very glad I chose Rheem brand. Its not often I encounter a company willing to stand behind their products, even after the warranty period. Oh, and if you disconnect the remote control wires from the main unit (unplug unit, then remove face panel and they will be labeled, hooked on 2 small phillips head screws, replace panel and plug back in) your unit should still (more often than not) kick on and heat to about 100F by default...a do-able shower temp :) hope this helps!
OMG 95 PSI is too high a pressure for a tankless! What was the W.C. in inches on the manometer?
Also on a T-K3 12 isn't a Code but a partial Code. You need an R/C to make this easier as counting led flashes produces wrong codes.
you'll have to find the correct code it's throwing not a partial.
And put a Pressure Reducer on this to below 60 PSI. 95 PSI is only impressive when it blows the tubing out after a few years.
Call Takagi in California not A.O. Smith in TN and they'll help someone fix this
F06
Drive motor tachometer error
The control is unable to properly detect motor speed and the machine will shut down. If a failure occurs during high-speed spin the door will be unlocked after 3 minutes.
Potential Causes
• Check wire harness connections between the Drive Motor/Tachometer and the Motor ControlUnit (MCU), and between the MCU and the Central Control Unit (CCU)
• Check the Drive Motor
• Check the MCU
• Check the Wire Harness
i think your flame sensor is bad but you will need to confirm that with rheem i am unsure what the c7 is for but code 12 is flame failure and there could be carbon build up on the flame rod...
code 14 is a big deal shut that thing down! you will burn it up if you keep running it, your over heat wrap on the heat exchanger is too hot. call rheem they can walk you through it
76 is a bad connection between the controller and the unit. try unplugging the controller and running it, also check the wiring between the two units. if that is not it. it means that one of the control boards it shot
I had the same problem and called the manufacturer. The error code C-8 was followed by the number 76. They told me to disconnect the thermostat/digital display from the main unit. This was fairly simple to do by removing the front panel. The unit works steady now without shutting down after a few minutes. The help desk told me that the main circuit board needs to be replaced for the unit to work with the display and that they would mail me one asap. At least we have hot water again.
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