Bosch Appliances GWH 2400 ES LP, GWH 2400 ES NG manual Problem solving, Error code diagnostics

Page 38

Problem solving

8Problem solving

8.1Error code diagnostics

To remove error code from the

idisplay, press the reset button.

Display

Cause

Solution

 

Fault in the flue gas limiter.

1. Check continuity of the flue gas limiter (see Fig. 63, page 46).

 

 

Go to steps two and three to determine air box temperature

 

 

sensor fault and replace it.

 

 

2. Check for flue gas leakage around the top and bottom seals of

 

 

heat exchanger as well as the viewing window.

 

 

3. Check that venting is within specifications (see Section 3.3).

 

 

Long vent lengths, venting with more than three elbows, blocked

 

 

vent or combination venting may cause this failure.

 

 

4. Check that flue gas limiter connector and spade connections

 

 

are secure.

 

 

5. Unplug heater and check the two main plug connections inside

 

 

the control board.

 

Jumper connection is not correct.

1. Check jumper connection on connector at upper right hand

 

 

corner of heat exchanger.

Backflow temperature sensor

1. Check backflow temperature sensor connection and resistance.

defect - happens if sensor is

See Fig. 61, page 44 and Fig. 63, page 46.

disconnected or short circuit.

2. Replace backflow temperature sensor.

Outlet temperature

sensor fault

1. Check red wire connections at hot water temperature sensor.

(Temperature below

freezing or

Clean terminals with an eraser. If badly corroded, replace sensor

above 210°F).

 

and wire harness. See Fig. 63, page 46.

 

 

2. Sensor may trip if water temperature drops below freezing to

 

 

protect heater from freezing conditions. Any damage due to

 

 

freezing conditions is not covered under warranty.

 

 

3. Clean inlet filter screen and clear any debris out of shower

 

 

heads, faucet aerators and whole house filters.

 

 

4. In areas where water has a high mineral content, periodic

 

 

descaling may be necessary.

Table 20

* By installer or service technician only.

38

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 DimensionsIntroduction Installation instructionsTools required for installation 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 Operation Use of optional remote control accessory part no. TSTAT2Reset button Program buttonAnnual maintenance Maintenance and serviceAnnual maintenance table Every year Winterizing for seasonal useMineral scale build-up Adjusting CO2 carbon dioxideDescaling using a pump Returning to Service Measuring CO2 combustion cover must be installedAdjusting CO2 Once Gas Pressure is adequateFinal Readings % 2.8 % 60 ppmComment Program Description Factory DefaultProgram values Control board diagnostics Diagnostic menuIntake Fan speed adjustmentTotal vent length calculation ExampleMaintenance and service To select fan speed Mode Pipe Length1 Fan speedWater is too hot TroubleshootingTroubleshooting 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 Description Reference Components diagramGroup 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 Packing Protecting the environmentProtecting the environment 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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