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Converting To A Different Gas Type; Troubleshooting - Bosch WR10**B SERIES Installation And Operating Instructions Manual

Gas instantaneous water heater
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Function check*
Flue gas safety device function check:
- Disconnect flue pipe
- Replace with pipe (about 50 cm long) with sealed end
- Fit pipe vertically
- Start up appliance at rated output and set temperature
control to maximum temperature.
Under those conditions, the appliance should shut down
after two minutes. Remove temporary pipe and reconnect
flue pipe.
* This work may only be carried out by an approved engineer.
3.7

Converting to a different gas type

Use only the genuine Bosch conversion kit. Conversion
may only be carried out by an approved technician.
3.8

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
6 720 607 823
Possible Cause
Batteries flat, incorrectly fitted or switch set to
Off
Batteries flat.
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.
Replace.
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

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This manual is also suitable for:

Wr11**b series