Problems; Problem/Cause/Solution - Bosch GWH 10-2 G Series Installation Manual And Operating Instructions

Problems

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
The heater does not ignite and digital
display is turned off.
Slow and difficult ignition of the burner.
Red LED in switch flashes.
Water at low temperature.
Water is not heated, no flame.
Digital display shows "E9".
Digital display shows "A4".
Incorrect temperature information in the
appliance digital display.
Digital display shows "E1".
Digital display shows "A7".
Digital display shows "F7" or "E0".
Digital display shows "EA".
Table 7
18
Cause
Switch turned off.
Reduced water flow.
Reduced water flow.
Insufficient gas supply. Gas Cylinders may
be empty
Temperature limiter has tripped
Flue gas safety device has tripped
Insuficient contact of the temperature
sensor.
Water temperature sensor has tripped
(outlet water temperature above 85 °C).
Temperature sensor incorrectly
connected.
Temperature sensor defective.
Blocked Heater.
There is spark but the main burner does
not ignite, heater blocked.No ionisation
probe signal .
Solution
Check switch position.
Call a qualified technician.
Call a qualified technician.
Check the temperature selector position
and adjust it according to the desired
water temperature.
If sufficient gas appears to be available call
a qualified technician.
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, call a
qualified technician.
Call a qualified technician.
Reduce the water temperature using the
gas and/or temperature adjustment
selector. If the problem persists, call a
qualified technician.
Call a qualified technician.
Call a qualified technician.
Turn the heater off and on, if the problem
persists, call a qualified technician.
Check:
• Gas supply, position of valves, empty
LP gas cylinders.
6 720 608 992 (2018/01)