Bosch WR 11 B - 8 Problems

6720648592 (2014/05)
18 | Problems
8 Problems
Assembly, maintenance and repairs must be performed by qualified technicians only. The following chart oers solutions to
possible problems (solutions followed by an * must be undertaken by qualied technicians only).
Problem Cause Solution
The heater does not ignite.
Slow and dicult ignition of the
burner.
Red LED in switch ashes.
Switch turned o.
Reduced water ow.
Flat batteries.
 Check switch position.
 Check and correct.
 Replace batteries.
Water at low temperature.  Check the temperature selector position and
adjust it according to the desired water
temperature.
Water is not heated, no ame. Insucient gas supply.  Check reducer, and if inadequate or
malfunctioning, replace it.
 Check if the bottles (butane) freeze during
operation, and if so, move them to a warmer
place.
The burner turns o the heater is
operating.
Temperature limiter has tripped.
Flue gas safety device has tripped.
 Wait 10 minutes and restart the heater. If the
problem persists, call a qualied technician.
 Vent the area. Wait 10 minutes and restart the
heater. If the problem persists, call a qualied
technician.
There is spark but the main burner
does not ignite.
No ionisation probe signal. Check:
• Gas supply,
• Ignition system (ionisation electrode and
electrovalves).
Reduced water ow. Insucient water supply pressure.
Dirty taps or mixers.
Gas valve blocked.
Heat exchanger blocked
(limescale).
 Check and correct. *
 Check and clean.
 Clean lter.*
 Clean and de-lime if necessary.*
Table 9