See specifications on page 2. Unlike storage tank water heaters, the burners of a tankless water heater must be very powerful to heat water instantaneously since they do this only at the time hot water is actually being used. It is therefore imperative that the gas pressure requirement be met exactly. Insufficient gas pressure will directly affect the water temperature at the time of usage. See page 2 for correct gas pressure settings.
3.Thermostat calibration is incorrect or thermostat is defective.
Contact your service person or call BBTNA.
4.Btu input is too low due to insufficient gas supply Make sure your main gas line is fully opened. If using LP gas, be sure that the size of the propane tank is adequate to supply the required gas pressure.
5.Cold water is mixing with the hot water between the AquaStar and the outlet
Compare water temperature at outlet of the AquaStar (hold the AquaStar’s outlet pipe with your hand) and at the tap. If these two are very different, check for mixing valve or plumbing crossover (see “MAIN BURNERS WILL NOT IGNITE...” paragraph #6).
6. Parts in water valve are dirty or damaged, which will prevent the gas valve from being fully opened.
Water valve maintenance needs to be performed, see #7 under BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON.
HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED
1. Unbalanced pressure in waterlines
The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by a much higher cold water pressure, which may cause the Aquastar burners to shut down (deactivate). Make sure faucet aerators or shower heads are free of minerals.
Do not add any flow restrictor to the shower head. Typically this deactivation symptom is a result of the hot water being too hot to use comfortably. Warm inlet water generally causes this. Lowering the control knob setting and/or reducing the inlet gas supply to the heater should correct this deactivation symptom.
2.Inlet water pressure is erratic due to inadequate supply water pressure or saturated pressure tank on well system
For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is
3.Cold water is mixing with the hot water between the AquaStar and the outlet
See #6 under “MAIN BURNERS DO NOT IGNITE WHEN HOT WATER TURNED ON”.
4 . Insufficient gas pressure
Note required gas pressures (page 2) and consult gas service person.
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