Bosch W14B - 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
Fault Possible Cause Solution
Appliance does not ignite. Batteries flat, incorrectly fitted or switch set to
Off Check position and refit/replace.
Pilot flame lights slowly/with difficulty Batteries flat. Replace.
Red LED flashes
Water not hot enough Check position of water temperature control and
adjust to obtain desired hot water temperature
Water not hot enough, no 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
Flame goes out while appliance is in
operation Temperature limiter has tripped Wait 10 minutes then restart appliance. If
problem recurs, call an approved technician.
Flue gas safety device has tripped Ventilate room. Wait 10 minutes then restart
appliance. If problem recurs, call an approved
technician.
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.*