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Error E02 indicates that the water temperature exceeded high limit.
Switch off the house circuit breakers dedicated to the water heater and then press the reset button located behind the control panel on the water heater.
to clear the 991 Takagi code, simultaneously press the bottom 2 grey buttons of the four just to the left of the flashing LED light. When the LED stops flashing, release and then press the reset button on the black panel about 8 inches above that
check comp board for led light and a reset on board ??? LED will also flash and give code with problem look for code on door panel or close bt and fallowinstructions????
F76 is a communication error. It usually occurs if you connect or disconnect a quick connect cable or remote control when the tankless heater is connected to electricity. (If you have a quick connect system, make sure you only have 1 remote and 1 quick connect cable.) To get rid of the code, try disconnecting electricity for 20 seconds, reconnecting electricity, and turning the remote on. If the code returns, you may need to replace your quick connect cable, remote cable, or even remote control
A 20 error code means the high limit switch is being tripped. This is most typically caused when scale develops in the heat exchanger. I'd recommend performing a descale on the heater to resolve the problem. Make sure to follow the instructions that came with your isolator valve kit.
The instructions for installing the sensor will probably included with the new part. Also, when you receive the part and actually see it, you will probably know where it will go. Sometimes, things like this happen even with new units. I have had bad thermocouples on brand new units right from the factory. It happens and unfortunately it happens to us sometimes. Good luck and if you get the part and still have trouble, contact them again. If you would have bought a GE (Rheem) unit, they would have sent a tech out to your house at no cost. I'm not a fan of Whirlpool water heaters.
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