Troubleshooting

6.8Error code diagnostics

Part numbers subject to change.

Display

Cause

Solution

 

 

 

A2

Fault in the flue gas limiter (part#

1. Check for flue gas leakage around the top and

 

8700400032).

bottom seals of heat exchanger as well as the

 

Note: Old style overheat cutoff fuse

viewing window. Look for any noticeable burn marks

 

(8700400019) has been replaced with this

or warping of the gaskets. If a leak is detected, seals

 

new limiter.

will need replacing.

 

 

2. Verify that venting meets specifications outlined

 

 

in chapter 3.6. Long vent lengths, incorrect venting

 

 

material, 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.

 

 

3. Check flue gas limiter wire connectors for

 

 

tightness. Clean with pencil eraser if any corrosion

 

 

is evident.

 

 

4. Trace wires from flue gas limiter to black

 

 

connector. Verify the connection is tight.

 

 

5. If limiter is tripped due to overheating, it must cool

 

 

down before error will clear on the control board.

 

 

 

A7

Hot water temperature sensor fault

1. Check red wire connections at the hot water

 

(Temperature below 36°F or above 210°F)

temperature sensor. Clean terminals with a pencil

 

(part# 8700400015)

eraser. If badly corroded, replace sensor and wire

 

 

harness. Verify that sensor is firmly clipped on to the

 

 

hot water copper pipe.

 

 

2. Sensor may trip if water temperature drops below

 

 

36°F. Protect heater from freezing condition as any

 

 

damage due to freezing conditions is not covered

 

 

under warranty.

 

 

3. Clean inlet filter screen per chapter 5.1 and clear

 

 

any debris out of showerheads, faucet aerators and

 

 

whole house filters.

 

 

4. In areas where water has a high mineral content,

 

 

periodic descaling may necessary. See chapter 5.3

 

 

for directions.

 

 

5. Swap sensor with the cold water sensor, keeping

 

 

respective wire connections as they are. If the

 

 

heater produces an E2 error, replace the sensor.

 

 

 

A9

Hot water temperature sensor not sensing

1. Check that the sensor is firmly attached to the

(Flashing)

expected output temperature.

horizontal section of the hot water pipe.

 

(part# 8700400015)

2. Clean inlet filter screen per chapter 5.2 and clear

 

 

any debris out of showerheads, faucet aerators and

 

 

whole house filters.

 

 

3. Verify that venting meets specifications outlined

 

 

in chapter 3.6. Long vent lengths, incorrect venting

 

 

material, 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 per chapter 3.8*. Low gas

 

 

pressure may prevent the heater from reaching

 

 

desired output temperature.

 

 

5. Check supply voltage is 120VAC and is properly

 

 

grounded.

 

 

6. Possible defective control unit. Call Bosch Water

 

 

Heating for further instructions.

 

 

 

Table 12

* By installer or service technician only.

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Bosch Appliances 2400E NG, 2400E LP manual Error code diagnostics, Display Cause Solution
Page 35 Page 37

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