Troubleshooting

 

 

 

 

Display

Cause

Solution

 

 

 

 

 

C1

Fan rotation too low on startup.

1. Disconnect power supply cord. Check wire

 

 

(part# 8707204039)

connections on back side of fan and the two large

 

 

 

wire connectors on the control unit. Removal of

 

 

 

lower access panel on control unit is necessary to

 

 

 

access connectors.

 

 

 

2. Verify that supply voltage is 120VAC and is

 

 

 

properly grounded.

 

 

 

3. Verify that venting meets specifications outlined

 

 

 

in chapter 3.6. Long vent lengths, venting with more

 

 

 

than three elbows, blocked vent or combination

 

 

 

venting may cause this failure. Verify backdraft

 

 

 

flapper inside flue gas collector is not stuck shut.

 

 

 

4. Check gas pressure. See chapter 3.8. Low gas

 

 

 

pressure may cause the fan to change its speed to

 

 

 

meet desired temperature.

 

 

 

5. Possible defective control unit. Call Bosch Water

 

 

 

Heating for further instructions.

 

 

 

 

 

C6

Fan rotation too low in operation

1. Disconnect power supply cord. Check wire

 

 

(part# 8707204039)

connections on back side of fan and the two large

 

 

 

wire connectors on the control unit. Removal of

 

 

 

lower access panel on control unit is necessary to

 

 

 

access connectors.

 

 

 

2. Check supply voltage is 120VAC and is properly

 

 

 

grounded.

 

 

 

3. Verify that venting meets specifications outlined

 

 

 

in chapter 3.6. Long vent lengths, venting with more

 

 

 

than three elbows, blocked vent or combination

 

 

 

venting may cause this failure. Verify backdraft

 

 

 

flapper inside flue gas collector is not stuck shut.

 

 

 

4. Ensure intake and exhaust terminations maintain

 

 

 

the required clearances stated in the manual ( Fig.

 

 

 

17 and Table 6 on page 17). Cross

 

 

 

contamination between intake and exhaust may

 

 

 

cause the fan to alter its rotational speed.

 

 

 

5. Check gas pressure. See chapter 3.8*. Low gas

 

 

 

pressure may cause the fan to change its speed to

 

 

 

meet desired temperature.

 

 

 

6. Possible defective control unit. Call Bosch Water

 

 

 

 

 

C7

No rotational speed sensor from fan.

1. Disconnect power supply cord. Check wire

 

 

(part# 8707204039)

connections on back side of fan and the two large

 

 

 

wire connectors on the control unit. Removal of

 

 

 

lower access panel on control unit is necessary to

 

 

 

access connectors.

 

 

 

2. Check supply voltage is 120VAC and is properly

 

 

 

grounded.

 

 

 

3. Possible defective component in fan. Call Bosch

 

 

 

Water Heating for further instructions.

 

 

 

 

 

CA

Water flow signal over specified maximum

1. Disconnect power supply cord and check wire

 

 

value.

connections on water valve and the two connectors

 

 

(part# 8708505016)

on the control board.

 

 

 

2. Excessive water pressure and flow. Ensure water

 

 

 

pressure is less than 150psi and flow rate is less

 

 

 

than 10 gallons per minute.

 

 

 

 

 

Table 12

* By installer or service technician only.

6 720 608 263

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Image 37
Bosch Appliances 2400E LP, 2400E NG manual Meet desired temperature

2400E NG, 2400E LP specifications

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