Troubleshooting

Display

Cause

Solution

 

 

 

 

F7

Ionization error at standby.

1. Loose connection to the flame ionization rod.

 

(part# 8708107020)

Verify that the thinner yellow wire leading from the

 

 

control unit is securely connected to the set of

 

 

electrodes located at the bottom right-hand side of

 

 

the heat exchanger.

 

 

 

2. Flame ionization rod or control unit may be

 

 

damaged. Contact Bosch Water Heating for further

 

 

instruction.

 

 

 

 

FA

Gas leakage error, gas valve circuit not

1. Disconnect power supply cord and check wire

 

closing properly.

connections on gas valve and the two connectors

 

(part# 8707021019)

on the control board.

 

 

 

2. Flow water out of a hot water tap above the

 

 

minimum activation point of .8GPM. Measure

 

 

voltage at the gas valve wire connector. The

 

 

connector should measure 24VDC between the left

 

 

pair of wires and 24VDC between the right pair of

 

 

wires when the unit is operating. If voltage is not

 

 

correct, contact Bosch Water Heating for further

 

 

instruction.

 

 

 

3. Gas valve may be defective, contact Bosch

 

 

Water Heating for further instruction.

 

 

 

 

8E

Electronic noise on control unit.

1. Improper resetting of other error codes. Using the

 

(part# 8707207239)

on/off switch or unplugging the power cord to reset

 

 

error codes can interrupt signal between

 

 

microprocessors inside control unit and show 8E on

 

 

the display. Only use the reset button (

) to reset

 

 

any error codes.

 

 

 

2. Possible defective control unit call Bosch Water

 

 

Heating for further instructions.

 

 

 

 

 

Table 12

* By installer or service technician only.

40

6 720 608 263

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Bosch Appliances 2400E NG, 2400E LP manual Heat exchanger Flame ionization rod or control unit may be

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