Maintenance and service

4Maintenance and service

Warning: Always turn off the electrical power supply, turn off the manual gas valve and turn off the manual water control 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

BSee instructions to remove front cover on page 8.

Systems and parts that should be checked at least once a year

Reference diagrams on pages 24 and 25. Venting system

Burners -see page 24 for observation window

See relief valve manufacture's instruction for pressure relief valve maintenance

Periodic cleaning of the water filter screen, see Fig. 15, chapter 2.10.

Flushing the heat exchanger with a descaling solution if mineral build up is evident. Scale build up will shorten the life of the water heater, descale heat exchanger thoroughly and repeat annually depending on mineral content of ground water.

5Troubleshooting

Introduction

The 250 SXO burner is activated by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement; Dirt in the inlet filter screen; Sediment build-up in faucet aerators, or shower heads; Uneven pressures between cold and hot (with single lever mix valves); and Plumbing crossovers. These water flow related problems can cause the heater to deliver less than its full output, or to fail to ignite or to shut down completely.

Problems stated below in upper case and in bold face should be investigated when there is a problem with the performance of the water heater but there is NO error code on the heater's LCD display or wireless remote control.

Any failures that result in a displayed error code are referenced on page 21. A Functional Scheme of the 250 SXO is detailed on page 23. If there is a problem with the installation, venting or operation of the unit, the heater will communicate the source by these error codes.

BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON

Cold incoming water connection made to wrong side of heater

Make sure cold water inlet connection is plumbed to the right side of heater when facing unit

Water flow rate at hot water tap is too low

A minimum of 0.8 gallon/minute (3 l/m) is required to activate the heater

Cold water inlet filter screen is dirty

Remove water inlet filter screen and clean. The screen is located at the inlet connection to the water heater, disconnecting the main cold supply line at the heater is required. Check and clean faucet aerator screens too.

Crossover in plumbing

The heater activates when there is sufficient water flow through its water valve, a minimum of 0.8 gallon/ minute (3 l/m) is required. If there is a crossover in the plumbing, the necessary hot water flow rate through the unit may not be reached, even though the flow at the hot water tap is sufficient. A plumbing crossover can be caused by a failed washer at a single lever faucet, incorrect plumbing or a faulty mixing valve in the piping. The crossover will create a back pressure on the water heater and prevent an adequate flow of water through it. To confirm there is no crossover in the plumbing, shut off the cold water supply feed to the water heater. Individually open each of the hot water taps. There should be no water flowing under a constant pressure. If there is a constant flow of water then the plumbing crossover must be corrected before the heater can operate properly.

WATER IS TOO HOT

Temperature selection too high

Lower temperature adjustment on heater or wireless remote control accessory, see chapter 3.2.

WATER IS NOT HOT ENOUGH

Temperature selection too low

Increase temperature adjustment on heater or wireless remote control accessory, see chapter 3.2

Btu input is too low due to inadequate gas line sizing

See specifications in chapter 2.8 - 2.9. The 250 SXO requires adequate gas pressure to reach desired temperatures, to compensate for inadequate gas supply or lack of gas pressure the 250 SXO will effectively reach the selected output temperature by reducing the hot water flow rate. Its motorized water valve makes this adjustment

Cold water is mixing with the hot water outlet (crossover)

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Bosch Appliances 250 SXO LP Maintenance and service, Troubleshooting, Burners do not Ignite When HOT Water is Turned on
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250 SXO LP, 250 SXO NG specifications

Bosch Appliances has long been a trusted name in home appliances, and its 250 SXO NG and 250 SXO LP models are no exceptions. Designed with both innovation and user convenience in mind, these cooking appliances cater to a variety of culinary needs while ensuring high efficiency and performance.

The Bosch 250 SXO NG and 250 SXO LP are built to provide optimal cooking experiences. One of their main features is the powerful BTU output, which allows for efficient and even cooking across all burner configurations. This enables users to achieve restaurant-quality results right in their kitchen.

These models are equipped with precision flame control, which means that users can easily adjust the heat for delicate dishes or higher temperatures for rapid boiling. Such flexibility is essential for those who enjoy experimenting in the kitchen. Additionally, the 250 SXO LP and NG models come equipped with sealed burners that effectively contain spills and make cleaning a breeze.

Another highlight of these Bosch appliances is their consistent ignition system, designed to deliver reliable starts every time. This feature eliminates the frustration often associated with lighting gas-powered cooktops. The integrated safety measures further enhance peace of mind; with flame supervision devices to shut off the gas supply if the flame goes out, these appliances provide an added layer of security for users.

The Bosch 250 SXO models shine in design as well. Crafted with sleek stainless steel, they are not only reliable but also add a touch of modern elegance to any kitchen. The intuitive controls are user-friendly, allowing cooks of all skill levels to operate the appliance with ease.

Moreover, both models offer compatibility with a variety of cookware, making them suitable for everything from small saucepans to large stockpots. Energy efficiency is also a primary consideration, as these appliances are designed to minimize energy consumption without compromising on performance.

In summary, the Bosch Appliances 250 SXO NG and 250 SXO LP are exemplary cooking appliances that combine powerful performance with sophisticated design. With their advanced technologies and user-centric features, they stand out as reliable options for anyone looking to elevate their culinary adventures.
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