Bosch WR8 series - Gas Type Conversion Procedure; Troubleshooting Common Problems

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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.
The operations marked with “*” may only be carried out by an approved technician
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.
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.*