Bosch C 1210 ESC Referenzhandbuch

Technical Service Bulletin:

A3 / E3 Error Code Troubleshooting

Models: C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES

Introduction

The following procedures are for gathering information to assist

Bosch Tech Support in determining the cause and solution to the

problem. Unplug power cord and remove outer and inner covers

from heater (refer to Installation Manual).

Note: The following bulletin applies only to serial numbers up to

FD986

Error code explanation:

A3 error code: Open jumper circuit

E3 error code: Incorrect resistance in jumper circuit

Tools needed:

Phillips head screwdriver

Ohmmeter

Troubleshooting procedure

1. Check position of jumper at top right of heat exchanger plugged

into connector on green wires (Fig. 1, pos.1).

Figure 1

If jumper is near heat exchanger or ﬂue gas collector, move

jumper to the right and tuck wires into clip on right side to

prevent jumper from overheating (Fig. 2, pos. 1).

Figure 2

2. Check that jumper is connected tightly to connector. Disconnect

and reconnect to improve connection.

3. Check for correct appliance type setting (model 830ES skip this

step):

a. Plug in heater's power cord and place heater into diagnostic

mode (refer to manual section 6.7).

b. Push “+” button until “P7” is displayed.

c. Push “P” button. Display should read “NO” or “NC”.

d. If display reads “Cd”, push “+” button until “NO” is dis-

played. Push “P” button for 5 seconds to save correct

appliance type.

e. Push power button to "off" position and back to "on"

position.

Before proceeding to the next step, plug in power cord and reset

the heater to see if error code has cleared. If error code will not

clear or occurs again during operation, move to step 4.

4 |A3 / E3 Error Code Troubleshooting Technical Service Bulletin

Data subject to change without notice | Printed in the USA | BTC 740002307 B | 06.2011 Bosch Thermotechnology Corp.

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-800-283-3787

Fax: 1-603-584-1687

www.bosch-climate.us

4. Remove control unit from heater and reseat wire connector on

circuit board:

a. Unplug heater‘s power cord.

b. Remove 3 screws attaching control unit to heater.

c. Turn control unit over.

d. Remove 6 screws attaching rear cover to control unit.

e. Remove rear cover.

f. Locate shorter of 2 multiple wire connectors on edge of

circuit board (Fig. 3, pos.1).

g. Remove and reinstall connector onto edge of board to

improve the electrical connection.

Figure 3

5. Ensure power cord is still unplugged or push power button to

"off" position. Disconnect jumper from connector and measure

resistance through jumper.

a. If less than 115 or greater than 125 ohms, jumper is faulty.

b. If between 115 and 125 ohms, contact Bosch Tech Support

for further instructions.

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