Problems - Bosch WR 11 B Installation Manual And Operating Instructions

18 | Problems

8 Problems
Assembly, maintenance and repairs must be performed by qualif
possible problems (solutions followed by an * mu
Problem
The heater does not ignite.
Slow and di cult ignition of the
burner.
Red LED in switch ashes.
Water at low temperature.
Water is not heated, no ame.
The burner turns o the heater is
operating.
There is spark but the main burner
does not ignite.
Reduced water ow.
Table 9
6720648592 (2014/05)
ied technicians only. The following chart o ers solutions to
st be undertaken by quali ed technicians only).
Cause
Switch turned o .
Reduced water ow.
Flat batteries.
Insu cient gas supply.
Temperature limiter has tripped.
Flue gas safety device has tripped.
No ionisation probe signal.
Insu ci ent water supply pressure.
Dirty taps or mixers.
Gas valve blocked.
Heat exchanger blocked
(limescale).
Solution
Check switch position.
Check and correct.
Replace batteries.
Check the temperature selector position and
adjust it according to the desired water
temperature.
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.
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.
Check:
• Gas supply,
• Ignition system (ionisation electrode and
electrovalves).
Check and correct. *
Check and clean.
Clean lter.*
Clean and de-lime if necessary.*