Operating instructions

5 Troubleshooting
5.1 General faults in the power supply
Error characteristics Cause of error Elimination of error
Nothing is shown on the dis‐
play
No power to the controller
General power failure
Main switch is turned off
FI circuit breaker or line pro‐
tection is switched off
Faulty fuse in the controller
Turn on the main switch
Switch on the FI circuit break‐
er or line protection
Replace the fuse – note the
amperage (10AT)
5.1.1 Behaviour of system after a power failure
When the power supply has been restored the boiler returns to the previous mode and
is controlled according to the specified program.
❒ After a power failure, check whether the STL has tripped.
❒ Keep the doors of the boiler closed during and after the power failure.
5.2 Excessive temperature
The safety temperature limiter (STL) shuts down the boiler when it reaches a tempera‐
ture of approx. 100°C. Once the temperature falls to below approx. 75°C, the STL can
be reset mechanically:
❒
Unscrew the cap on the safety temperature limiter
❒ Reset the safety temperature limiter by pressing with a screwdriver
❒ Replace the cap
5
Troubleshooting
General faults in the power supply
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