Troubleshooting - Bosch WR11 series Installation And Operating Instructions Manual

3.7

Troubleshooting

Installation, servicing and repairs may only be carried out by an approved engineer.
The following table illustrates only a few solutions to straightforward problems.
Fault
Appliance does not ignite.
Pilot flame lights slowly/with difficulty
Red LED flashes
Water not hot enough
Water not hot enough, no flame
Flame goes out while appliance is in
operation.
Reduced water flow rate.
The operations marked with "*" may only be carried out by an approved technician
6 720 607 529
Possible Cause
Switch set to Off
Low water flow.
Low water flow.
Gas supply dynamic pressure too low
Temperature limiter has tripped.
Flue gas safety device has tripped.
Inadequate inlet flow rate.
Dirt in water service cock or mixer unit.
Automatic water valve clogged.
Heat exchanger clogged (scale).
Solution
Check position and refit/replace.
Check and adjust.
Check and adjust.
Check position of water temperature control and
adjust to obtain desired hot water temperature.
Check gas cylinder governor and replace if
incompatible or damaged.
Check whether gas cylinder (butane) is freezing
when appliance is in operation and re-site in
warmer location if necessary.
Wait 10 minutes then restart appliance. If
problem recurs, call an approved technician.
Ventilate room. Wait 10 minutes then restart
appliance. If problem recurs, call an approved
technician.
Check and adjust.
Check and clean.
Clean filter.*
Clean and descale as necessary.*
7