Bosch W11P - Manual (Page 7)

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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.
The operations marked with “*” may only be carried out by an approved technician
Problem Cause Solution
Pilot flame stay alight. Blocked pilot burner. Clean.*
Several atempts required to turn pilot
flame on.
Yellow pilot flame.
Flame goes out while appliance is in
operation. Flue gas safety device has tripped Ventilate room. Wait 10 minutes then restart
appliance. If problem recurs, call an approved
technician.
Temperature limiter has tripped. Wait 10 minutes then restart appliance. If
problem recurs, call an approved technician.
Water not hot enough. Check output selector position and regulate
according with needs.
Water not hot enough, weak flame. Gas supply dynamic pressure too low. 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.
Reduced water flow rate. Inadequate inlet flow rate. Check and adjust.
Dirt in water service cock or mixer unit. Check and clean.
Automatic water valve clogged. Clean filter.*
Heat exchanger clogged (scale). Clean and descale as necessary.*