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Bosch Appliances GWH 2400 ES NG, GWH 2400 ES LP manual Problem solving Display Cause Solution

Models: GWH 2400 ES NG GWH 2400 ES LP

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Problem solving

Display

Cause

 

 

Solution

(Flashing)

Outlet

temperature

sensor not

1. Check that the sensor is firmly attached to the hot water pipe

 

sensing

expected

output

(see Fig. 69, page 52).

 

temperature.

 

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

 

 

 

 

heads, faucet aerators and whole house filters.

3.Check venting specifications are met. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.

4.Check gas pressure. Low gas pressure may prevent the heater from reaching desired output temperature.

5.Check supply voltage. It must be 120VAC and properly grounded.

6.Possible defective control unit call Bosch Water Heating for further instructions.

7.Ensure that outlet temperature sensor is not placed on any bends in the hot water pipe or misreading may occur.

 

Primary fan rotation too low on

1. Disconnect power supply cord and check wire connections on

 

operation.

back side of primary fan and the two connectors on the control

 

 

board (see Fig. 70, page 53).

 

 

 

2. Check supply voltage. It must be 120VAC and properly

 

 

grounded.

 

 

 

3. Check venting specifications are met. Long vent lengths,

 

 

venting with more than three elbows, blocked vent or combination

 

 

venting may cause this failure.

 

 

 

4. Ensure intake and exhaust terminations maintain the required

 

 

minimum clearances stated in the manual. Cross contamination

 

 

between intake and exhaust may cause the fan to alter its

 

 

rotational speed.

 

 

 

5. Check gas pressure. Low gas pressure may cause the fan to

 

 

change its speed to meet desired temperature.

 

 

 

6. Possible defective control unit call Bosch Water Heating for

 

 

further instructions.

 

 

No rotational speed sensor signal

1. Disconnect power supply cord and check wire connections on

 

from primary fan.

back side of primary fan and the two connectors on the control

 

 

board (see Fig. 70, page 53).

 

 

 

2. Check supply voltage. It must be 120VAC and properly

 

 

grounded.

 

 

 

3. Possible defective component in fan or defective control unit

 

 

call Bosch Water Heating for further instructions.

(Flashing)

Water flow signal over specified

1. Disconnect power supply cord and check wire connections on

 

maximum value.

water valve and the two connectors on the control board (see

 

Water flow > 10 gallon/min.

Fig. 70, page 53).

 

 

 

2. Excessive water pressure and flow. Ensure water pressure is

 

 

less than 150psi and flow rate is below 10 gallons per minute.

 

Internal hardware/software failure.

1. Disconnect power supply cord and check the two wire and

 

 

ground connections on control board as well as ground connection

 

 

on heater chassis.

 

 

 

2. Pushing the wrong combination of buttons on the control unit

 

 

can create confusion among the microprocessors inside. In this

 

 

case, the error code should not happen more than once or twice.

 

 

Turn off the water heater. Turn water heater back on and try

 

 

resetting error code. Use the reset button (

) to reset any error

 

 

codes.

 

 

 

3. Possible defective control unit. Call Bosch Water Heating for

 

 

further instructions.

 

Table 20

* By installer or service technician only.

6 720 608 782

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Page 39
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Bosch Appliances GWH 2400 ES NG, GWH 2400 ES LP Problem solving Display Cause Solution, Venting may cause this failure
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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.