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2 | TWH-G2-23 | 2400E, 2400EO, 250SX, 250SXO, 635ES, 635ESO
Cleaning electrode set
1. If electrode set gasket is discolored or torn, replace with a new
gasket.
2. Using steel wool, gently polish all surfaces of the flame sensor
rod and electrodes.
Electrode set
Electrode gasket
Electrodes
Flame sensor
8mm retaining nuts
Replacing electrode set
1. Gently place new gasket on studs. The studs will hold the gasket
in place.
2. Carefully feed tips of electrode set into bottom of burner bed
and rotate out while inserting.
3. Ensure proper seal between bottom of burner bed and the
electrode set.
4. Replace the two 8mm retaining nuts.
5. Connect the two similar yellow wires to the left and center
terminals (ignitor rods). Connect the thinner yellow wire to the
right terminal (Flame sensor). Ensure the connectors fit snugly
on the terminals.
6. Place thin black o-ring around the outside lip of the gas/air
mixer.
7. Push air intake duct in place with two hands and hold. Ensure
the top of the air intake duct is level and the back rubber gasket
is tucked under the bed.
8. Replace two phillips-head screws on the bottom of the air intake
duct.
9. Replace holding bracket and cover.
10. Plug unit in and turn power switch to on (I) position. Reset any
error that is displayed.
11. Open manual gas shut off valve.
12. Return to service.
Data subject to change without notice | Printed in the USA | 01.2007
Service bulletin
BBT North America Corporation
Bosch Group
Bosch Water Heating
340 Mad River Park
Waitsfield, VT 05673
Telephone 800-642-3111
Fax (802) 496-6924
techsupport@boschwaterheating.com
Bosch Water Heating
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