Bosch C 1210 ESC Reference manual

Technical Service Bulletin:

C6 & C7 Error Code Troubleshooting

Models: C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES,

2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500

Introduction

This procedure must be performed by a qualiﬁed technician.

DANGER!

120 VAC present in wire connections. Use caution

when testing.

Follow the procedures below and report results to Bosch Technical

Support. This will assist in determining the cause and solution to the

problem.

C6 and C7 error codes

These errors are fan-related error codes with the following

explanations:

C6 error indicates the primary fan rotation is too low during

operation.

C7 error indicates there is no primary fan rotation sensed

during an attempted start-up.

Primary Fan Assembly

The primary fan is a 120 volt AC fan that receives power from

the main control board.

The primary fan has its own built-in circuit board which relays

information and signals back to the control board.

Tools needed:

Phillips head screwdriver

Digital Multi-meter

Procedure

1. Press the reset button on the control panel of the heater to

attempt to clear the error code. If the error code does not reset

or continues to reoccur, proceed with the following trouble-

shooting steps.

2. Conﬁrm that the exhaust vent is not blocked and does

not exceed the speciﬁed maximum length as shown in the

installation manual.

3. Ensure that the 3 foot minimum separation between air intake

and exhaust vents is met (applies to a twin pipe vent system).

4. Verify the heater is plugged into a properly grounded 120V AC

power supply.

5. Supply the heater with a steady supply voltage. It is

recommended to supply electricity from a dedicated electrical

circuit with no other major appliances on the same circuit.

6. Shut off power to the heater and unplug from electrical outlet.

Remove cover per installation manual.

7. Remove the black plastic intake (Fig.1, pos.1) that is secured

with three Phillips head screws to the fan (Fig.1, pos.2).

Figure 1

8. Check the wire connection to the fan. The wire connection is

located on the back, left hand side of the fan housing. (Fig. 2).

Data subject to change without notice | Printed in the USA | BTC 740002330 A | 05.2014 Bosch Thermotechnology Corp.

Technical Service Bulletin

2 | C6 & C7 Error Code Troubleshooting

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-800-283-3787

Fax: 1-603-965-7581

www.bosch-climate.us

Figure 2

9. Check that the wire connections to the control board are ﬁrmly

attached to the board. Removal of the lower access cover on

the control board is required. Refer to Bulletin TWH-G3-24.

10. Remove wire connection from back of fan, plug in heater and

turn power on with water shut off. Check for voltage AC on the

plug between the 1st and 2nd pin. You should ﬁnd 120VAC (Fig.

Figure 3

a. If the plug shows 120 VAC between the pins, the

primary fan needs to be replaced.

b. If the plug shows no voltage between the pins; shut

power off, disconnect plug from the outlet, and check

the 2.5A white fuse inside of the control unit (Fig. 4).

Refer to Bulletin TWH-G3-24. If the 2.5A white fuse has

continuity, then the control unit needs to be replaced.

c. If the 2.5A fuse is blown, replace with spare from the

back cover of the control unit, remove the connection

from the primary fan, and remove both wire connections

from the secondary fan (Fig. 5).

d. Reconnect primary fan only, turn power on, run

water for 30 seconds. LEAVE SECONDARY FAN

DISCONNECTED

Figure 4

Figure 5

e. If fan turns on, unit ignites, and/or E4, then shut the

power off and reconnect the secondary fan. If C6 or C7

and/or the fuse blows before connecting the secondary

fan then the primary fan needs to be replaced.

f. With both primary and secondary fans connected, turn

power on, and run water. If no issues, then just a bad

fuse. If the 2.5A fuse blows then the secondary fan

needs to be replaced.

After completing this procedure, please call us while still at

the unit at 1-800-798-8161 for diagnosis and resolution. If

it is more convenient for you, please email the results of

this procedure to ldy[email protected] and we will reply

within one business day.

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