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 the higher cold water pressure in the building, which may cause the Aquastar burners to shut down (deactivate).

Do not add any flow restrictor to the shower head. Position the gas control slide to the single flame ( ) setting to reduce the burner output and/or turn the temperature adjustment knob counterclockwise to lower the maximum water temperature.

Note: turning the knob counterclockwise will increase the activation flow rate.

2. Temperature balance valves

If the inlet water temperature to the water heater is very warm the heater can produce temperatures that may be found to be too hot. A temperature balance shower valve can automatically mix in cold water to reduce such hot water temperature, in the event of any temperature instability with the use of a temperature balance shower valve, refer to shower valve manufactures instructions for internal adjustment setting. Adjustments should be made to the hottest setting in the shower valve. Additionally the temperature control of the heater can be adjusted to produce a more comfortable hot water temperature. See SETTING THE WATER TEMPERATURE section.

3.Cold water is mixing with the hot water between the AquaStar and the outlet

See #6 under “Burners do Not Ignite When Hot Water Is Turned On”.

4.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 30-50 psi (2.07-3.45 bar).

5. Gas pressure is too low

See page 2 and 10 for correct specifications.

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Bosch Appliances 125B LP, 125B NG HOT Water Temperature Fluctuates / Unit Deactivated, Unbalanced pressure in waterlines
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125B NG, 125B LP specifications

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