Bosch C1050ES Manuale di riferimento
Technical Service Bulletin:
Replacing The Control Unit
Models: C1050ES, C950ES, 940ES, 940ESO, 830ES
Introduction
Tools needed:
Phillips head screw driver
Small flat head screw driver
Needle-nosed pliers
Note: Avoid touching printed circuit board (PCB) as static discharge
may damage circuitry.
Preparation
Push power button to "OFF" and unplug power cord.
Loosen two Phillips head screws on bottom rear of front cover.
Pull cover bottom outwards then lift cover upwards to remove.
Removing control unit
Remove three Phillips screws on front of control unit. (Fig. 2,
pos. 1)
Turn control unit to expose the rear. (Fig. 2, pos. 2).
Locate and remove 6 Phillips head screws on back of control
unit (Fig. 2, pos. 3).
control unit front
3
3
co
n
t
r
o
l
u
ni
t
f
r
o
n
t
3
3
Figure 2
Remove rear cover from control unit to expose circuit board
electrical connections. Slide wire restraints out of control unit.
(Fig. 3, pos. 1).
Remove two large electrical strip connectors by pulling them
away from board. (Fig. 3, pos. 2).
Remove medium sized electrical strip connector by pulling it
outwards. (Fig. 3, pos. 3).
Remove small electrical strip connector by pulling it outwards.
(Fig. 3, pos. 4).
Remove two large ignition wires by pulling them outwards. (Fig.
3, pos. 5).
Remove yellow/green striped ground wire spade connection by
depressing tab on connector and pulling it gently off the board.
(Fig. 3, pos. 6).
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).
Loosen Phillips head screw and remove green ground wire con-
nection for power cord. (Fig. 3, pos. 8).
Figure 3
1
1 1
2
23
45
6
7
8
Remove control unit from the water heater.
Appliance evaluation for PCB jumper location
Please evaluate the following prior to installation of the replacement
PCB:
2
|Replacing The Control Unit Technical Service Bulletin
Data subject to change without notice | Printed in the USA | BTC 740002317 C | 06.2012 Bosch Thermotechnology Corp.
Locate rating plate sticker on right side of heater cover.
Determine model number (Fig.1, pos.A) and gas type (Fig.1,
pos.B).
Figure 1
Locate hot water outlet pipe (Fig.2, pos.A). Determine the type
of outlet temperature sensor installed on the hot water outlet
pipe (Fig.3).
Figure 2
Figure 3
Surface mount outlet
temperature sensor
Immersed outlet
temperature sensor
PCB jumper installation
In order for the appliance to work correctly, the proper jumpers
must be installed on the PCB board. (Fig.4)
Backside of control unit
B
ackside o
f
control uni
t
Figure 4
Based on your model, gas type and type of outlet temperature
sensor, jumpers should be installed on the PCB in the following
arrangement:
C 950 ES or 830 ES with surface mount outlet temperature
sensor
Natural
Gas
N
atura
l
Gas
Figure 5
Liquid
Propane
C 950 ES or 830 ES with immersed outlet temperature sensor
Figure 6
NO
JUMPER
NEEDED
Natural
Gas
Liquid
Propane
3
|Replacing The Control Unit Technical Service Bulletin
Data subject to change without notice | Printed in the USA | BTC 740002317 C | 06.2012 Bosch Thermotechnology Corp.
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel: 1-800-283-3787
Fax: 1-603-965-7581
www.bosch-climate.us
C 1050 ES or 940 ES/ESO with surface mount outlet
temperature sensor
Figure 7
Natural
Gas
Liquid
Propane
C 1050 ES or 940 ES/ESO with immersed outlet temperature
sensor
Figure 8
Natural
Gas
Liquid
Propane
Replacing control unit
Once the appropriate jumpers have been determined, remove
rear cover of replacement control unit.
Install jumpers in the proper location on PCB.
Connect green ground wire from power cord to replacement
control board with Phillips head screw. (Fig. 3, pos. 8).
Reconnect black and white power cord wires to terminal
block on replacement control unit; Black -L (Load), White - N
(Neutral). Secure to terminal block by tightening 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).
Reattach large ignition wires to replacement control board (no
polarity). (Fig. 3, pos. 5).
Reconnect small electrical strip connector to replacement
control board. (Fig. 3, pos. 4).
Reconnect medium sized electrical strip connector to
replacement control board. (Fig. 3, pos. 3).
Reconnect two large electrical strip connectors to replacement
control board. (Fig. 3, pos. 2).
Reseat rubber wire restraints in control unit. (Fig. 3, pos. 1).
Replace rear cover on unit using 6 Phillips screws. (Fig. 2, pos.
3).
Place control unit back into water heater and secure with 3
Phillips head screws. (Fig. 2, pos. 1).
Plug water heater power cord back into electrical outlet and
push On/Off button on water heater to "ON".
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