Bosch C1210ES Specifications download pdf (Page 51)

6 720 644 887

Error codes

Primary fan rotation too low in

operation.

1. Reset errors, disconnect power supply cord and check wire

connection on back side of fan and the connectors on the control

board, see

Fig. 84

page 66

2. Check supply voltage. It must be 120VAC and properly

grounded.

3. Check that venting meets installation specifications. Long vent

lengths, venting with more than three elbows, blocked vent or

combination venting may cause this failure.

4. Ensure intake and exhaust terminations maintain the required

minimum clearances. Cross contamination between intake and

exhaust may cause the fan to alter its rotational speed.

5. Check gas pressure. Low gas pressure may cause the fan to

change its speed to meet desired temperature.

6. Possible defective control unit call Bosch Water Heating for

further instructions.

No rotational speed sensor signal

from primary fan.

1. Reset errors, disconnect power supply cord and check wire

connections on back side of primary fan and the two connectors

on the control board, see

Fig. 84

page 66

2. Check supply voltage. The heater must be connected to

120VAC on a properly grounded dedicated outlet.

3. Possible defective component in fan or defective control unit

call Bosch Water Heating for further instructions.

(Flashing) Water flow signal over specified

maximum value.

Water flow > 10 gallon/min.

(Status message).

1. Disconnect power supply cord and check wire connections on

water valve and the two connectors on the control board, see

Fig.

page 66

2. Excessive water pressure and flow. Ensure water pressure is

less than 150psi and flow rate is below 10 gallons per minute.

Over-temperature detected by

outlet temperature sensor.

Temperature > 203°F

1. Check that the outlet sensor is firmly attached to the vertical

section of the hot water pipe, see

Fig. 83

page 65

2. Check red wire connections at hot water temperature sensor.

Clean terminals with an eraser. If badly corroded, replace sensor

and wire harness.

3. In areas where water has a high mineral content, periodic

descaling may be necessary. See chapter

6.3

page 41

for

directions.

4. Check sensor (ref.

page 54, chapter 9).

Cold water temperature sensor

fault.

1. Check connector on wires coming from top of watervalve for a

secure connection. See

Fig. 77

page 58

2. Sensor may trip if water temperature drops below 36°F (2

C).

Protect heater from freezing conditions as any damage due to

freezing conditions is not covered under warranty.

3. Measure sensor resistance (ref.

page 55, chapter 10).

Display Cause Solution

Table 29

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 71 72

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Bosch C1210ES Specifications Page 51

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