Bosch Appliances 125FX LP, 125FX NG specifications Water is TOO HOT

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WATER IS TOO HOT

1. Temperature Selection too high

Turn the temperature adjustment knob counter-clockwise (to the left) to lower the maximum water temperature.

Note: This will increase the activation flow rate.

2.Inlet water temperature is very warm (60º-75ºF) Reduce inlet gas supply to lower the heaters degree rise. Note: Only the Model 125BS should be used if the inlet water is preheated.

3.Inlet filter screen is clogged, restricting flow Remove screen and clean it.

WATER IS NOT HOT ENOUGH

1. Temperature selection is set too low.

Change the setting. Turn the temperature selector knob clockwise (to the right). Note: this will decrease the activation flow rate.

2.Water flow through the heater is higher than the capacity of the AquaStar to heat it

Reduce the flow demand at the faucet. See flow rates at specific temperatures on page 2.

3. Gas pressure is insufficient

It is extremely important for a tankless instantaneous water heater to have the right size gas line to obtain the correct gas pressure. 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 and see page 9 for proper gas line sizing.

4. Gas supply is insufficient

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. See gas pipe sizing chart on page 9.

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 “NO SPARK AT THE PILOT” paragraph 4). Where automatic “anti-scald” valves are required by code, lower the temperature setting on the AquaStar as much as possible and balance the pressure between cold and hot water after the AquaStar.

6.Gas valve above the water valve is not fully opening.

If the internal water valve parts are damaged from water quality or use, or there is evident corrosion where the water valve and gas valve connect, then immediate service is needed. See step 9 under the problem NO SPARK AT THE PILOT. White vinegar should be applied first to any corrosion before the loosening of screws.

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. Cold water is mixing with the hot water between

the AquaStar and the outlet See #4 under “NO SPARK AT THE PILOT”.

3.Inlet water pressure is erratic due to inadequate supply water pressure or saturated pressure tank on well system

Check the inlet water pressure. On a private well, raise minimum pressure setting to 30 psi. Confirm that the pressure tank is not water logged.

4.Gas pressure is too low

See page 2 for correct specifications.

EXHAUST FAN DOES NOT OPERATE

1.Check the fuse (see fig 10)

2.Check all electrical connections

3.Check adjustment of fan microswitch

FAN CIRCULATES WHEN HOT WATER IS SHUT OFF

1. Check adjustment of fan microswitch

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Contents Table of Contents For Your SafetyWhat to do if YOU Smell GAS Unpacking the Aquastar Heater FeaturesPrinciple of Operation Aquastar Model 125FX Proper Location for Installing Your Heater General Rules to Follow For Safe OperationMounting Installation Combustion AIR Requirements ClearancesVenting Spill Switch SafetyFreeze Warning Horizontal Side Wall Some Venting Guide SuggestionsSide wall exit locations for mechanical draft vent terminals GAS Line Sizing For Natural GAS For LP GASMaximum Inlet Pressure Settings Water ConnectionsAltitude Natural Gas Liquid Propane Above 4.500 ft consult your local gas providerWiring Diagram for AQ 125FX Connecting the pressure relief valve PRVElectrical Connections For Your Safety Read Before Operating Your HOT Water Heater Setting the Water TemperatureLighting and Operating Instructions Operating InstructionsTemperature Adjustment Knob No Spark AT the Pilot Pilot Lights but Burners will not Come on Pilot Sparks Continuously with no Water RunningMain Burners GO OUT During HOT Water USE Water is TOO HOT Diagram of AquaStar 125FX Interior Components Diagram Parts List 125FX Interior Components Diagram and Parts List Maintenance Table see pages 13 Controlled Energy Corp

125FX NG, 125FX LP specifications

Bosch Appliances has been a leader in the home appliance industry for decades, known for their innovation, efficiency, and reliability. Among their notable offerings are the Bosch 125FX LP and 125FX NG, two versatile models designed for modern kitchens that cater to the needs of both home cooks and professional chefs.

One of the standout features of the Bosch 125FX models is their dual-fuel capability. With options for liquid propane (LP) and natural gas (NG), these appliances provide flexibility in fuel choice, maximizing efficiency and performance. Users can select the type of gas that best suits their culinary style and kitchen setup, ensuring optimal cooking results.

Both models boast a powerful burner system that includes multiple high-performance burners. Featuring a high-output burner designed for rapid heating, these appliances allow for quick boiling and searing, making them ideal for time-sensitive cooking. Additionally, a simmer burner is included which provides low heat for delicate sauces and simmering dishes, striking a balance between power and control.

The Bosch 125FX series incorporates advanced cooking technologies that elevate the user experience. One significant technology is the precise temperature control, which ensures that cooking temperatures remain consistent, reducing the risk of overcooking or burning meals. The built-in oven features a convection cooking option, allowing for even heat distribution, resulting in perfectly baked goods and roasted dishes.

Another notable characteristic of these appliances is their sleek and modern design. Bosch has a reputation for creating aesthetically pleasing products that fit seamlessly into contemporary kitchen environments. Premium materials, rounded edges, and clean lines give the 125FX models a sophisticated look that appeals to style-conscious consumers.

User-friendly features are also prominent in both the LP and NG models. Intuitive knobs and controls allow for easy adjustments, while the large oven capacity provides ample space for multiple dishes, perfect for families or entertaining guests. Additionally, Bosch's commitment to energy efficiency means these appliances not only save on energy bills but also decrease the environmental footprint of your home.

In summary, the Bosch 125FX LP and 125FX NG are premier appliance choices for anyone looking to enhance their kitchen. With powerful cooking capabilities, innovative technologies, and a stylish design, they encapsulate Bosch's commitment to quality and performance in home appliances.
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