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Bosch W 135 K B Series Installation, Servicing And User Instructions page 4

Gas fired instantaneous water heaters

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3.2
Flue gas safety device
3.4
Fault Finding
Problem
Appliance does not ignite.
Slow and difficult ignition of pilot
burner.
Burner extinguishes while in
operation.
Insufficient water temperature.
Insufficient water temperature,
short flame.
Pilot burner doesn't spark with
water flow.
Insufficient water flow.
* To be handled by authorised personnel only.
All manuals and user guides at all-guides.com
3.3
parts supplied by the manufacturer.
Possible Cause
Misplaced or worn out batteries.
Worn out batteries.
Flue gas safety device activated.
Wrong output selected.
Insufficient gas pressure.
Dirty/damaged gas filter or burner.
Unadjusted micro-switch screw.
Insufficient water pressure.
Dirty taps or mixers.
Blocked water valve.
Blocked heating body (scale).
Servicing
use only original spare
Solution
Check
position
necessary.
Replace
Ventilate the room and re-ignite the
appliance some minutes later. If it
happens
again,
registered technician.
Check position of water temperature
selector and adjust according to your
output needs.
Check if gas container freezes while in
use. If so, place it in a warmer location.
Check if gas inlet governor is of
appropriate type, and is in good
working
condition.
necessary.*
Clean gas filter and burner.*
Turn the water off.*
Remove cover cap from lower part of
micro-switch and turn the screw off
until the sparking begins, then turn
further 1 and 1/2 turns.
Check and adjust.
Check and clean.
Clean the filter.*
Clean and de-scale.*
and
replace
if
contact
a
Corgi
Replace
if

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This manual is also suitable for:

W 275-1 k b seriesW 350-1 k b seriesW 400-1 k b series