Related Manuals for Bosch GWH 635 ES
Summary of Contents for Bosch GWH 635 ES
- Page 1 Service Bulletin Booklet For Bosch model water heaters GWH 635 ES, GWH 635 ESO, GWH 2400 E, GWH 2400 EO, AQ250SX, AQ250SXO...
- Page 2 TWH-G2-23 Replacing and cleaning electrodes TWH-G2-24 Replacing control unit TWH-G2-25 Gas conversion TWH-G2-26 Replacing water valve TWH-G2-27 Attenuator installation TWH-G2-28 Replacing gas valve TWH-G2-29 Flue gas limiter retrofi t Data subject to change without notice | Printed in the USA 4.2007 Bosch Water Heating...
- Page 3 TWH-G2-02 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Overcoming temperature fl uctuations Introduction 3. Any water running is a sign of a plumbing crossover. Consult a local plumber or service person for help. This condition must be Temperature fl uctuations from hot to cold during use are typi- corrected before the heater can operate properly.
- Page 4 Use the controls on the front on the heater to lower the output temperature. Most people use hot water in the range of 100- 110F. BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com...
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Page 5: Measuring Gas Pressure
TWH-G2-03 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Measuring gas pressure Introduction Static Pressure Test In order to meet design capacities of this unit, the gas supply 1. Turn gas supply back on. must meet the design requirements. 2. - Page 6 Gas meter or regulator is not set to deliver enough gas or is defective. Have gas or propane supplier verify proper operation. BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com...
- Page 7 TWH-G2-04 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Remote instruction Introduction 2. The numbers in parantheses indicate the version of the manual. Use the following table to determine which instruction manual to The remote control initialization instructions vary based on the use.
- Page 8 8 | TWH-G2-04 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO TWH-G2-04 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com...
- Page 9 TWH-G2-05 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Checking and replacing temperature sensors Introduction 3. If the either sensor is not in it’s respective location, move to the proper location immediately. Ensure that the sensor is fi rmly The inlet and outlet temperature sensors work together to clipped and making good contact with the copper pipe.
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Page 10: Testing Temperature Sensors
If sensor readings are accurate according to the table but still give inconsistent temps or an error code, contact Bosch Water Heating Technical Support at 800-642-3111. Temperature sensor readings Temperature Approximate resistance reading 32 °F... - Page 11 TWH-G2-06 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Winterizing and freeze prevention Introduction Please note that installation instructions state that the water heater must not be installed in a location where it may be exposed to freezing temperatures. If the heater must be left in a space which is likely to experience freezing temperatures (less than 36°...
- Page 12 1 2 | TWH-G2-06 | 2400E, 2400EO, 635ES, 635ESO, 250SX, 250SXO Service bulletin BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com Data subject to change without notice | Printed in the USA | 1.2007...
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Page 13: Control Board Diagnostics
3003 and mode and press the ‘M’ button. A reading of 25 on the display newer. Contact Bosch Water Heating at 1-800-642-3111 with would indicate the heater is reading a fl ow rate of 2.5 gallons/ questions. - Page 14 BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com Data subject to change without notice | Printed in the USA | 1.2007...
- Page 15 9. Make sure inlet water is on, gas is on, and power is on and run a hot water tap and the heater should be operating fi ne now. 10. If the problem persists, please contact Bosch technical support at 800-642-3111 for further assistance.
- Page 16 16 | TWH-G2-11 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO TWH-G2-04 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com...
- Page 17 TWH-G2-12 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Measuring and adjusting CO Introduction 3. Insert CO2 analyzer probe into the measuring port. The tip of the probe should be in the center of the fl ue pipe (approx 1.5” NOTE: The CO levels can only be adjusted by a certifi...
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Page 18: Returning To Service
A plastic #40 Torx screw will be revealed. Adjusting P2 CO level BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 2. Adjusting the plastic #40 Torx screw counter-clockwise will Fax (802) 496-6924 lower P2 CO2 levels and clockwise will raise P2 CO2 levels. - Page 19 TWH-G2-13 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO Service bulletin Descaling Introduction 15. Position a container below the hot water outlet and reconnect cold water supply. Open cold water supply isolation valve and Periodic descaling may be necessary in areas with high mineral fl...
- Page 20 2 0 | TWH-G2-13 | 2400E, 2400EO, 635ES, 635ESO, 250SX, 250SXO Service bulletin BBT North America Corporation Bosch Group Bosch Water Heating 340 Mad River Park Waitsfi eld, VT 05673 Telephone 800-642-3111 Fax (802) 496-6924 techsupport@boschhotwater.com Data subject to change without notice | Printed in the USA | 03.2007...