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Bosch 715ES Service Bulletin

Replacing the control unit
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Service Bulletin G3-24
Models: 715ES, C800ES, 2400ES, 2700ES
Replacing the control unit
Introduction
Tools needed:
Phillips head screw driver
Small flat head screw driver
Needle-nosed pliers
Note: Avoid touching printed circuit board as static discharge may
damage circuitry.
Preparation
1. Push power button to "OFF" and unplug power cord.
2. Loosen two Phillips head screws on bottom rear of front cover.
Pull cover bottom outwards then lift cover upwards to remove.
Removing control unit
1. Remove three Phillips screws on front of control unit. (Fig. 2,
pos. 1)
2. Turn control unit to expose the rear. (Fig. 2, pos. 2). Remove
hot water sensor from pipe to ease turning.
3. Locate and remove 6 Phillips head screws on back of control
unit (Fig. 2, pos. 3).
control unit front
control unit front
4. Remove rear cover from control unit to expose circuit board elec-
trical connections. Slide wire restraints out of control unit.
(Fig. 3, pos. 1).
5. Remove two large electrical strip connectors by pulling them
away from board. (Fig. 3, pos. 2).
6.. Remove medium sized electrical strip connector by pulling it
outwards. (Fig. 3, pos. 3).
7. Remove small electrical strip connector by pulling it outwards.
(Fig. 3, pos. 4).
8. Remove two large yellow ignition wires by pulling them out-
wards. (Fig. 3, pos. 5).
9. Remove yellow/green striped ground wire spade connection by
depressing tab on connector and pulling it gently off the board.
(Fig. 3, pos. 6).
10. Loosen two small flat head screws on terminal block for power
cord. Pull black and white wires free from terminal block and
control unit. (Fig. 3, pos. 7).
11. Loosen Phillips head screw and remove green ground wire
connection for power cord. (Fig. 3, pos. 8).
Figure 2
2
1
12. Remove control unit from the water heater.
13. Natural Gas heaters only: Remove jumper from JP6 connection
on control board. This jumper must be installed on replacement
control board. (Fig. 4 ).
3
2
4
6
8
1
Figure 3
7
5
1

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  Summary of Contents for Bosch 715ES

  • Page 1 Service Bulletin G3-24 Models: 715ES, C800ES, 2400ES, 2700ES Replacing the control unit Introduction 4. Remove rear cover from control unit to expose circuit board elec- trical connections. Slide wire restraints out of control unit. Tools needed: (Fig. 3, pos. 1). Phillips head screw driver 5. Remove two large electrical strip connectors by pulling them  Small flat head screw driver away from board. (Fig. 3, pos. 2).  Needle-nosed pliers 6.. Remove medium sized electrical strip connector by pulling it  outwards. (Fig. 3, pos. 3). Note: Avoid touching printed circuit board as static discharge may 7. Remove small electrical strip connector by pulling it outwards. damage circuitry. (Fig. 3, pos. 4). 8. Remove two large yellow ignition wires by pulling them out- Preparation wards. (Fig. 3, pos. 5).
  • Page 2  | G3-24 | 715ES, C800ES, 2400ES, 2700ES Service bulletin Figure 6 Figure 4 8. Reconnect medium sized electrical strip connector to replacement control board. (Fig. 3, pos. 3). 9. Reconnect two large electrical strip connectors to replacement Replacing control unit control board. (Fig. 3, pos. 2). 10. Reseat rubber wire restraints in control unit. (Fig. 3, pos. 1). 1. Remove rear cover of replacement control unit. 11. Replace rear cover on unit using 6 Phillips screws. (Fig. 2, pos. 2. Reinstall jumper on JP6 connection of replacement control 3). board. (Natural Gas water heaters only). (Fig. 4). 12. Place control unit back into water heater and secure with 3 3. The replacement control unit comes with an extra jumper Phillips head screws. (Fig. 2, pos. 1). supplied. Depending on the water heater‘s serial number this 13. Plug water heater power cord back into electrical outlet and jumper may need to be attached to the replacement control unit. push On/Off button on water heater to "ON". Determine the heater‘s serial number by locating the rating sticker on the right side of the front cover (Fig. 5) Programming Condensing/Non-condensing mode...

This manual is also suitable for:

C800es2400es2700es