Rinnai RU160IN user manual

There could be several reasons why you are not getting hot water from your Rinnai RU160IN tankless water heater:
1. Power Source: Check to see if the unit is properly plugged in or if a fuse has tripped if it is hardwired to your home.
2. Gas Supply: Confirm that there isn’t an issue with your gas supply. If your other gas appliances are working fine, then the problem likely lies elsewhere.
3. Water Supply: Check that your water supply is on and running properly. No water flow will trigger the heater to shut off.
4. System Error: Your system may have an error code displayed on the unit's control panel. This could indicate several issues like a faulty ignition or flame failure. You can refer to your user manual to understand the meaning of these error codes.
5. Temperature Setting: Check the temperature setting on the heater, it may be set too low.
6. Faulty Parts: Faulty parts like a broken heat exchanger, a dirty or broken burner, a bad ignition module, could cause the heater to not function properly.
7. Cold Incoming Water: Make sure the incoming water is not too cold as extremely cold water can make it harder for the heater to heat up the water to the desired temperature.
8. Obstructed Vents or Exhausts: If your heater's vents or exhausts are blocked, your heater may not work properly.
9. Mineral Build-Up: If you have hard water, mineral scale can build up in the heater over time and could affect its operation.
If you are unable to diagnose or solve the problem by yourself, you should consider contacting a professional Rinnai service provider.

Testing a Rinnai ignitor, including the one for model RU160IN, should be done by a qualified service technician. This procedure involves inspecting the ignitor for visible damage, measuring its electrical resistance, and checking its current draw during operation. Here is a simplified procedure to understand what it's like:
1. Turn off the water heater and disconnect it from power.
. Locate the ignitor, which is typically positioned near the gas burner.
3. Check the ignitor visually for any cracks or other visible damage. Replace the ignitor if it's damaged.
4. Use a multimeter set to resistance (Ohms) mode, then measure the ignitor's resistance by connecting the multimeter probes to the ignitor's terminals. The exact resistance value could vary depending on the ignitor type, so you need to compare it with the manufacturer-specified resistance value for the specific Rinnai model.
5. If the measured resistance is significantly different from the specified value, it indicates that the ignitor is likely faulty.
Doing these steps requires specialized knowledge and skills. It could also be risky due to the involvement of gas, electricity, and high temperatures. Always seek professional help when dealing with such specialized equipment.

The priority light on a Rinnai tankless hot water heater indicates that the unit is prioritizing the demand for hot water from a particular source. This means that if multiple fixtures or appliances require hot water simultaneously, the unit will ensure that the priority source (such as a shower) receives a continuous supply of hot water, while other sources may experience a slight decrease in temperature or pressure. The priority light typically turns on when a hot water tap is opened, and it will turn off when all hot water sources are closed.

The priority button on the Rinnai RU160IN water heater is used to set the priority level for hot water supply in a multi-unit or multi-bathroom setup. When the priority button is activated, it ensures that the designated unit or bathroom receives hot water first, even if other faucets or showers are in use. This feature is particularly useful in scenarios where hot water demand might exceed the unit's capacity, ensuring that the priority area always has a sufficient supply of hot water.