Bosch Appliances GWH 2400 ES LP, GWH 2400 ES NG manual Control board diagnostics, Diagnostic menu

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Maintenance and service

6.6Control board diagnostics

1.Turn on/off switch on water heater to off (O) position.

2.Press and hold the program ( ) button while turning the on/off switch to the on (I) position. The display will cycle through a startup procedure including the software version.

3.Release the ' ' button when '188' appears on the display. The display should read 'P2' when the program button is released. If not, repeat process.

4.Press and release the ' ' button on the control panel until the display reads 'P4'. You are now in the diagnostic mode of the control board.

5.When the display reads 'P4', press and release the

' ' button once again and the display should read 'E'.

6.Use the ' ' and ' ' button on the control board to cycle through different diagnostic modes available.

7.Once in the selected diagnostic mode of your

choice, press and release the ' ' button to display the diagnostic information.

EXAMPLE: to read the flow rate in gallons per minute while the unit is flowing water, cycle to the '3d' mode

and press the ' ' button. A reading of 25 on the display would indicate the heater is reading a flow rate of 2.5 gallons/minute.

8.Once the information is obtained, press the ' ' button again to return to the diagnostic mode menu and scroll to addition diagnostic information.

9.To exit the diagnostic mode of the heater, use the

' ' or ' ' button until the display reads 'E'.

10.Press the ' ' button once again and the display should read P4.

11.Turn the on/off switch off (O) and back on (I) again to return heater to normal function.

Diagnostic menu

EEntry/Exit into sub-modes

0d

Set-point temperature (°F)

1d

Inlet water temperature (°F)

2d

Outlet water temperature (°F)

3d

Water flow (gallons/min)

4d

Gas type (LP or NG)

5d

Fan speed (Hz)

6d

Burner power (%)

7d

Maximum power (kW)

8d

Back flow temperature (°C)

9d

Flue gas temperature (°F)1)

1F

Most recent error/failure

2F

2nd most recent error

3F

3rd most recent error

4F

4th most recent error

5F

5th most recent error

6F

6th most recent error

7F

7th most recent error

8F

8th most recent error

9F

9th most recent error

10F

10th most recent error

Table 16

1)Available only on model GWH C800 ES

32

6 720 608 782

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Contents Intended for variable flow applications What to do if you smell gasIndex For your safety FCCAppliance details FeaturesGWH 2400 ES Specifications Technical data Unpacking the GWH 2400 ES heater Appliance details To remove front cover To remove combustion cover service onlyGeneral rules to follow for safe operation Dimensions and Minimum installation clearances DimensionsInstallation instructions Tools required for installationIntroduction VentingVent Safety System Fittings or Piping Equivalent FeetDescription Minimum distance Installation instructions Venting configuration examples Venting Flex ProTech Heat Fab Installation instructions Condensate drain requirementsRoom sealed installation Twin Pipe System Determining installation adjustment ExhaustInstallation instructions Vent connections Combustion air requirements Twin pipeMounting installation Proper location for installing your heaterHeater placement and clearances Gas piping & connections GAS Connections For Natural GAS Water connections Water qualityRecirculation application Recirculation applicationMeasuring gas pressure Position of the fuses in control unit Electrical power supplyElectrical connections Operation instructions LCD Display functionsTemperature selection For your safety read before operating your water heaterPower Use of optional remote control accessory part no. TSTAT2 Reset buttonOperation Program buttonMaintenance and service Annual maintenance table Every yearAnnual maintenance Winterizing for seasonal useMineral scale build-up Adjusting CO2 carbon dioxideDescaling using a pump Measuring CO2 combustion cover must be installed Adjusting CO2Returning to Service Once Gas Pressure is adequateFinal Readings % 2.8 % 60 ppmComment Program Description Factory DefaultProgram values Control board diagnostics Diagnostic menuFan speed adjustment Total vent length calculationIntake ExampleMaintenance and service To select fan speed Mode Pipe Length1 Fan speedTroubleshooting TroubleshootingWater is too hot Water is not hot enoughNoisy burner/heater during operation Hot water temperature fluctuates at tapLow water flow/pressure Troubleshooting Problem solving Error code diagnosticsProblem solving Display Cause Solution Venting may cause this failureOver-temperature detected by No flame ionization detected with Electrical diagram Electrical diagramSensor resistance charts Back Flow characteristics GWH 2400 ES Functional scheme Functional schemeInterior components Interior components diagram and parts listInterior components diagram and parts list Appliance overview Components diagram GroupDescription Reference Item DescriptionInterior components diagram and parts list Group Interior components diagram and parts list Group Interior components diagram and parts list Group Interior components diagram and parts list Group 708 300 Protecting the environment Protecting the environmentPacking ComponentsLimited Warranty Bosch Thermotechnology Corporation

GWH 2400 ES NG, GWH 2400 ES LP specifications

Bosch Appliances has established a reputation for delivering high-quality and innovative home solutions, and the Bosch GWH 2400 ES LP and GWH 2400 ES NG are no exceptions. These high-efficiency water heaters are designed to provide on-demand hot water, ensuring comfort and convenience for your home.

One of the standout features of the Bosch GWH 2400 ES LP (Liquid Propane) and GWH 2400 ES NG (Natural Gas) models is their compact, space-saving design. These tankless water heaters are engineered to fit in smaller spaces, making them an ideal choice for homes with limited installation areas. Despite their compact size, both models provides a powerful performance that meets the hot water needs for multiple fixtures simultaneously, such as showers, faucets, and washing machines.

These water heaters are equipped with advanced technology that enables precise temperature control. The Bosch GWH 2400 ES series utilizes a microprocessor-based control system that allows for consistent water heating, ensuring the water temperature remains stable even during high demand. The modulating gas valve further optimizes energy consumption, adjusting the flame intensity to meet the exact heating needs, thus enhancing efficiency.

In terms of safety, both the GWH 2400 ES LP and NG come with multiple safety features. These include a flame failure safeguard, overheating protection, and a built-in freeze protection system. Such features ensure both peace of mind and the longevity of the unit.

Installation is straightforward with these models, as they can be vented using standard venting materials, saving time and costs. Additionally, the units boast a low NOx emissions rating, making them environmentally friendly choices that help homeowners reduce their carbon footprint.

Maintenance is minimal, thanks to the corrosion-resistant heat exchanger which ensures durability and long service life under normal operating conditions. This factor, combined with Bosch’s renowned commitment to quality, makes these models a reliable investment for any household.

Whether you opt for the GWH 2400 ES LP or the GWH 2400 ES NG, you will experience the benefits of a powerful, efficient, and safe water heating solution tailored to your specific household needs. Bosch has truly combined technology, sustainability, and user comfort in these innovative models, solidifying their place as leaders in the home appliance market.
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