Noritz Tankless Not Working: Dead Remote or No Response
On this page (6 sections)
The Short Answer: If a Noritz shows nothing on the remote, check power first: the outlet, the breaker and any GFCI. If the remote works but the heater doesn’t respond when hot water runs, Noritz points to reversed plumbing and a clogged inlet filter, and it needs enough flow to start. In cold weather, also consider freezing. Noritz says freeze protection doesn’t work when the unit is unplugged.
Narrow it down
| What you see | Likely problem | Section |
|---|---|---|
| Remote completely dark | No power to the heater, or a remote or cable fault | Power |
| Remote on, power button off | Unit switched off | Press the power button |
| Remote on, nothing happens when hot water runs | Not enough flow, clogged filter, reversed plumbing | Flow |
| Water won’t come out of hot taps | Frozen, valve closed, or filter blocked | Freezing and flow |
| Remote flashes a number | The heater is reporting a fault | See Noritz no hot water |
| Water leaking from the unit | Freeze damage or a fitting | Turn off and call |
Power
- Outlet and plug. Most Noritz indoor units plug into a nearby outlet. Make sure it’s plugged in. If it’s a GFCI outlet, or downstream of one, press reset once.
- Breaker. Check the circuit for the outlet. If it’s tripped, reset it once. If it trips again, leave it off and call an electrician.
- Remote controller. If the heater has power but the remote stays dark, the remote or its cable may have a fault. A technician can check it.
Flow
A Noritz starts only when it senses enough water flow. The NRC1111 guide lists a 0.5-gallon-per-minute minimum. When the unit doesn’t try to ignite while water is running, Noritz says to check for reversed plumbing or crossed pipes, and to check the water drain valve filter.
- Open a fixture fully on hot, such as a tub spout, to rule out low flow.
- Check the water supply valve at the heater is fully open.
- Clean the filter. On the NRC1111, the inlet filter is part of the water drain valve. The guide’s steps are: close the water supply valve, open hot fixtures, remove the drain plugs with a bucket ready, take out and brush the filter, then reinstall everything and check for leaks.
- New installation? If it has never worked, the hot and cold connections may be reversed. That’s an installer fix.
Freezing
Noritz’s guide says the freeze-prevention heaters protect the unit only while it has power. Freeze protection works whether the power button is on or off, but not if the plug is pulled. It doesn’t protect pipes outside the unit, which need insulation or heat tape.
If water won’t flow because the unit is frozen, Noritz’s steps are: close the gas and water valves, turn off the power button, and open the water supply valve from time to time to check whether water flows. When it flows again, check for leaks before using the heater. Noritz warns not to use the heater while it or the piping is frozen. If water drips from inside the cabinet after thawing, see tankless leaking after a freeze.
What the technician will check
A technician will confirm power at the unit and check its internal fuse, transformer and control board. They test the remote and its wiring, and test the flow sensor if the heater ignores flow. They also inspect for freeze damage and confirm the plumbing is connected correctly.
Frequently Asked Questions
Q: Should I unplug my Noritz when I go on vacation? A: Not in freezing weather. Freeze protection needs power. If the heater won’t be used for a long period and could freeze, Noritz’s guide describes draining it instead.
Q: My new Noritz has never worked. Is it defective? A: Check installation issues first. Noritz lists reversed or crossed plumbing, and debris in the inlet filter from new piping is common. The installer should check both before a warranty claim.
Manuals and supporting references
These links distinguish general safety information from model-specific documentation. A manual directory helps you locate your unit’s instructions; it does not establish that every model uses the same parts, codes, or test values.
- Noritz NRC1111 owner's guide (SBA8723) (opens in a new tab)Noritz NRC1111-DV and NRC1111-OD: freeze prevention, draining, filter cleaning, and 'unit does not attempt to ignite' troubleshooting.
- Noritz: product support and technical literature (opens in a new tab)Find the specific model’s owner guide and code definitions.
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