Bosch GWH 10-2 G Series, Installation Manual And Operating Instructions

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18
Problems
6 720 608 992 (2021/02)
8 Problems
8.1 Problem/cause/solution
Assembly, maintenance and repairs must be performed by qualified technicians only. The following chart offers solutions to
possible problems.
Problem Cause Solution
The heater does not ignite and digital
display is turned off.
Slow and difficult ignition of the burner.
Red LED in switch flashes.
Switch turned off.
Reduced water flow.
Reduced water flow.
Check switch position.
Call a qualified technician.
Call a qualified technician.
Water at low temperature. Check the temperature selector position
and adjust it according to the desired
water temperature.
Insufficient gas supply.
Call a qualified technician.
Water is not heated, no flame. Insufficient gas supply. Gas Cylinders may
be empty If sufficient gas appears to be available call
a qualified technician.
Digital display shows “E9” .
Digital display shows “A4” .
Temperature limiter has tripped
Flue gas safety device has tripped
Wait 10 minutes and restart the heater. If
the problem persists, call a qualified
technician.
Vent the area. Wait 10 minutes and restart
the heater. If the problem persists, check:
- Is fluing correct?
- Adequate ventilation?
- Negative pressure environment?
Call a qualified technician.
Incorrect temperature information in the
appliance digital display. Insuficient contact of the temperature
sensor. Call a qualified technician.
Digital display shows “ E1 ”. Water temperature sensor has tripped
(outlet water temperature above 85 °C). Reduce the water temperature using the
gas and/or temperature adjustment
selector. If the problem persists, call a
qualified technician.
Digital display shows “ A7 ”. Temperature sensor incorrectly
connected.
Temperature sensor defective.
Call a qualified technician.
Call a qualified technician.
Digital display shows “ E0 ”. Ignition failure. Refer to EA solution.
Call a qualified technician.
Table 7