5 Troubleshooting
5.1 General fault with power supply
Error characteristics Cause of error Elimination of error
Nothing is shown on the
display
No power to the controller
General power failure
Main switch is turned off
FI circuit breaker or line
protection is switched off
Faulty fuse in the controller
Turn on the main switch
Switch on the FI circuit
breaker 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 (high-limit thermostat) has tripped.
❒ Keep the doors of the boiler closed during and after the power failure, at least until
the induced draught fan automatically starts up again.
5.2 Excessive temperature
The high-limit thermostat (STL) shuts down the boiler when it reaches a temperature
of max. 105°C. The pumps continue to run.
Once the temperature falls below approx. 75°C, the STL (high-limit thermostat) can be
reset mechanically:
❒
Unscrew the cap on the STL (high-limit thermostat)
❒ Unlock the STL (high-limit thermostat) by pressing with a screwdriver
Troubleshooting
5
General fault with power supply
Operating Instructions T4 24-150 | B0830317_en 41
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