Maintenance and service | Bosch Appliances GWH-345/450-ESR-L

Maintenance and service

5Maintenance and service

Warning: Always turn off the electrical power supply, turn off the manual gas valve and turn off the manual water shut off valves whenever servicing.

The unit should be checked once a year by a gas technician. If repairs are needed, the repairs should be done by a gas technician

To remove front cover

BLoosen the two Philips head screws (as shown in Fig. 2).

B Pull control panel upwards and then pull it downwards.

BLift front cover panel upward and remove.

Yearly maintenance

Refer to diagrams on pages 35 and 36.

•Inspect venting system for leaks, blockage or other damage

•Unclip 4 access clips and remove cover to inspect and clean burner assembly

•Manual operation of the pressure relief valve to insure correct operation

•If flow is reduced or error AA is activated, flush the heat exchanger with a descaling solution if mineral build up is evident. Scale build up will shorten the life of the water heater and is not covered by warranty. Descale heat exchanger thoroughly and repeat annually depending on mineral content of ground water.

5.1Service mode

The service mode provides diagnostic information to the technician with a variety of real time parameters. See Table 15 for the parameters and their respective meaning.

Accessing the service mode

BSwitch on the equipment.

BPress and hold the reset button

BRotate the hot water temperature sensor dial to the minimum and to the maximum.

Now the appliance is in the Service Mode.

Selecting parameter

BRotate the recirculating water temperature selector

(left dial) to scan the different parameters.

Rotating clockwise accesses the next parameter (increasing).

Once the desired parameter number has been selected, the digital display will change to the value stored in that parameter.

Adjusting parameters

BRotate hot water temperature selector dial to change the value of the parameter (only parameter 03 and 22).

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GWH-345/450-ESR-L, GWH-345/450-ESR-N specifications

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In summary, Bosch Appliances GWH-345/450-ESR-N and GWH-345/450-ESR-L models represent the pinnacle of modern water heating technology. With their energy-efficient performance, advanced safety features, user-friendly controls, and durable construction, these water heaters are designed to meet the demands of today’s homes while delivering reliable hot water whenever needed. These innovative appliances reinforce Bosch's reputation as a leader in home heating solutions, ensuring that customers can enjoy hot water with confidence and peace of mind.