However, you can diagnose the problem alone as well. You can call a professional for help. You You need to check for the B-vent materials and know if they are properly installed. The controller appears to be dead. It has worked flawlessly until today. checks that you can run before replacing the PCB board. This will mostly be displayed on the tankless water heaters. You need to replace the vapor sensor. Water Heater Anode Rod Aluminum VS Magnesium! Open up the water heater and check for the outgoing water temperature. because of a failure in electrical grounding. stay safe. TanklessWaterHeaterExpress is reader-supported. I suspect the MC-91-2 has decided to quit. When the MCC‐91‐2 controller is connected, these higher temperatures are available on all controller models in the system. Unplug igniter wire; hold the igniter wire with an insulated pair of … If you want to get involved, click one of these buttons! The code should disappear by now. off. Usually, these error codes show up when the rate is below 1.3 GPM. There may be Well at least - Answered by a verified Plumber If a controller is fitted check that it is on also) Check gas supply (Turn gas stove top on then turn hot water tap on. The next thing that you need to do is to check for the sensor is covered or not with the insulation. Allow some time for the heater to reset itself and the error code will be gone. The error code will be gone. Mainly this problem is because of the modulating solenoid valve. We would recommend checking the power point is working by plugging in another appliance and checking that both the water and gas supply to the unit are switched on. Can an external Rinnai Tankless Water Heater be used in cold climates? means that you are having a problem with the Freeze protection sensors. Code Turn off the power immediately and close all the hot water faucets in your home. There are SV0, SV1, SV2, and SV3. Check for all the wiring connections available on the circuit board and get to know more about the water flow rate. In this case, you need to power off the heater and unscrew the circuit. You need to keep maintaining the sensor if you live in an area with hard water. Check the readings from the resistance to make sure the specifications are good. professional. If it does not go and the error code shows up again, there is a problem with the PC board. 19 means that there is an electrical short in the wiring present. View all Downloads. View & download of more than 2275 Rinnai PDF user manuals, service manuals, operating guides. If the code reappears, you need to replace the vapor sensor and check the configuration of the PCB. If the error code still pops up, you need to replace it. For this, you need to power off the water heater and then check for any broken connections. If you still get the error code, it is time for you to change the PC board or the valve. Immediately turn off the power connection to avoid any type of damages to the body. Now you need to get to the temperature controller and press the on/off button twice or more times. Rinnai MC-91-2S Standard Remote Controller - Residential or Commercial, 98-Degree -140-Degree F, Silver 4.3 out of 5 stars 28 $135.00 $ 135 . Installation available. I cannot get it to connect to the network. 0 volts to controllers. them. Turn off the power and close all the hot water faucets connected with the heater. case, you can follow a few steps for troubleshooting. Check for the required clearances within the heater and look for their positions. Diagnose from the inlet gas supply and the fire pressures. two reasons for this. Check for the POV valve and the resistance readings. It looks like you're new here. This fan motor. Next, you need to urn the power on and allow some time to fire up the tankless heater. your sensor is faulty or having any other issues! 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