Tankless Water Heater Flow Sensor Bypass

A repairman removed the 1st sensor and told me the impeller turbine would not spin.

Tankless water heater flow sensor bypass.

I find that to be the case with the 2nd sensor. Navien flow sensors detect water flow which in turn enables the unit to ignite and heat cold water within the heat exchanger. But i don t know how much force it takes to make it spin. I bought both as spares so that when i need them i will have them to get my unit up and running again.

A hot water tap is opened. Flow sensors are also used in tankless water heaters. Other than cleaning flushing descaling a tankless water heater the flow sensor and flame rod assembly are the first parts that will go bad. Upon flow detection the flow sensor sends the activation signal to the.

Navien filters and navien flow sensors. Rinnai tankless gas water heaters need a demand of at least 0 4 to 0 6 gallons per minute of water flow through the hot side to ignite and 0 26 gallons per minute to stay in operation. 9 years on the tankless water heater and loving it which is also about the length of time these to parts will last. Once the water flow reaches app.

1 2 gallon per minute the water heater will sense a flow rate sufficient to ignite the natural gas or propane resulting in hot water. The opened tap allows water to flow through the water heater. In europe and other regions pressure pump showers with flow sensor based utility metering technology are widely used. A flow sensor performs the same function but provides the added benefit of measuring the rate of water flow.

My research suggests this sensor is the same sensor used in a jacuzzi tankless water heater model j s199w which may require a change of dip switch settings. You see every tankless water heater has a minimum flow rate which is the minimum amount of water measured in gallons that the tankless unit needs flowing through it every minute gpm to produce hot water. The bypass valve bv mixes cold water into the outgoing hot line to reduce pressure loss and increase speed of modulation. Tankless combustion process using all the sensors the computer controls the components that manage the air gas and water flow amounts to meet the varying levels of demand it encounters from the hot water fixtures.

If you have an older tankless water heater 10 years old the problem is most likely that the minimum flow rate is too high. Tankless advantage tankless water heaters provide endless hot water when sized appropriately for your home s needs. If the flow rate falls below these levels the energy efficient rinnai unit will turn off because it senses that hot water isn t needed. If the vc water heater s freeze protection sensor thermistor is unplugged cut shorted it will allow the water heater to fire up.

Check sensor wiring harness for loose broken or damaged connections from sensor back to pc board.