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My question is this - could a water crossflow issue possibly contribute to intermittent error code 11 (and most recently 12) issues? To me, the crossflow issue, from the heater's perspective, would manifest as reduced hot water demand from the heater - but unclear to me how this could cause 11 or 12 error code. I have identified the offending valve (thermostatic valve in a freestanding tub filler, of course there are no shutoff valves - I just replaced the cartridge and it still has crossflow issues - separate saga!) We have several single handled shower and tub valves throughout the house that could potentially cause such an issue. He did however identify a separate water crossflow issue somewhere in the house (cold water entering hot water lines through a single handled faucet) and said I needed to have that issue fixed before he would do anything further. Also assured me that gas supply (natural gas) appeared adequately sized. He told me that there's no way a scale issue could cause an error code 11 and he cleaned out the flame rods. They sent out a plumber who said the unit would need to be descaled before he could do more troubleshooting. Since we are still (barely) under a home warranty program from purchasing the house, I figured I would let them deal with it. When I went to the attic to investigate the unit was flashing an 11 error code. Finding the exact cause is important to apply the right solution and get your water heater running again. Several months ago we began experiencing intermittent issues with getting no hot water. An error code 11 on a Rinnai tankless water heater can appear due to an issue with the ignitor, gas supply, flame rod, venting, excess moisture, and more. Here is the summary of what can go wrong with your Rinnai water heater and what to look for after the error code 11 shows up on the remote controller. The installation also must comply with the instructions supplied by Rinnai. Below, we’ll break down these issues in more detail and tell you the proper steps to take when you encounter an Error Code 11. Unfortunately, many issues can lead to an Error Code 11, including issues with the igniter, flame rod, venting, and more. Had been running fine since we purchased the house last November. the appliance rises, the heater filter indicator will flash indicating that. A Rinnai Error Code 11 indicates no gas supply or ignition on your Rinnai water heater system. We have a 4 year old Rinnai RL94 tankless water heater in our attic. Hi I have a Rinnai rhfe-1004f wall furnace, I keep getting a code 14 (overheat) there is no filter blockage or problem, what I see happening is the convection fan doesn't continue to run after burner shut off to dissipate heat from cabinet it turns off when burner does and top of cabinet gets warm with no air flow.
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