Bosch 715ES Service Bulletin page 2

 | G3-24 | 715ES, C800ES, 2400ES, 2700ES
Replacing control unit
1. Remove rear cover of replacement control unit.
2. Reinstall jumper on JP6 connection of replacement control
board. (Natural Gas water heaters only). (Fig. 4).
3. The replacement control unit comes with an extra jumper
supplied. Depending on the water heater's serial number this
jumper may need to be attached to the replacement control unit.
Determine the heater's serial number by locating the rating
sticker on the right side of the front cover (Fig. 5)
a) If serial number is FD 891 or less, the jumper needs to be
applied to JP2 on the control unit. (Fig. 6)
b) If serial number is FD 892 or greater, no jumper is needed
on JP2.
4. Connect green ground wire from power cord to replacement
control board with Phillips head screw. (Fig. 3, pos. 8).
5. Reconnect black and white power cord wires to terminal block
on replacement control unit. Secure to terminal block by tighte-
ning flat head screws. (Fig. 3, pos. 7).5. Reconnect yellow/
green striped ground wire to spade connection on replacement
control board. (Fig. 3, pos. 6).
6. Reattach large yellow ignition wires to replacement control board
(no polarity). (Fig. 3, pos. 5).
7. Reconnect small electrical strip connector to replacement
control board. (Fig. 3, pos. 4).
Data subject to change without notice | Printed in the USA | BTC 712002303 A | 01.2009
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
control board. (Fig. 3, pos. 2).
10. Reseat rubber wire restraints in control unit. (Fig. 3, pos. 1).
11. Replace rear cover on unit using 6 Phillips screws. (Fig. 2, pos.
3).
12. Place control unit back into water heater and secure with 3
Phillips head screws. (Fig. 2, pos. 1).
13. Plug water heater power cord back into electrical outlet and
push On/Off button on water heater to "ON".
Programming Condensing/Non-condensing mode
Figure 5
Note: The following does not apply for model GWH 2400 ES
GWH 715 ES and GWH 2700 ES water heaters must be programmed
to the Non-condensing mode. The GWH C 800 ES water heater must
be programmed to the Condensing mode.
00113 00113
1. Push On/Off button to the "OFF" position.
2. While depressing and holding the "P" program button, push the
On/Off button to the "ON" position.
3. Release the P" program button when 188 appears on display.
4. P2 should now appear on the display. If not, repeat process.
5. Press the "+" button until P7 appears on the display.
6. Press the "P" program button again to display the appliance
mode.
7. Either "NO" or "Cd" will appear on the display. Models GWH 715
ES and GWH 2700 ES must be set to "NO" and the GWH C 800
ES must be set to "Cd".
8. Use the "+" button to scroll between "NO" and "Cd" modes. To
save the set mode, depress and hold the "P" program button
until the display flashes. The mode is now saved.
Note: Refer to venting section of the installation manual supplied
with the heater to determine if minimum power (P2) fan
speed adjustment is necessary
9. Press the On/Off button to "OFF" then again back to "ON"
position to return heater to normal operation.
Service bulletin
Figure 6
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel: 1-866-642-3198
Fax: 1-603-584-1681
www.boschhotwater.com
Bosch Thermotechnology Corp.