Froling P4 - Troubleshooting; Power Supply and System Faults; Handling Excessive Temperatures

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6 Troubleshooting
6.1 General faults in the power supply
Error
Cause of error
Error correction
Nothing is shown on the
display
No power to the controls
General power failure
FI circuit breaker or line
protection is switched off
Switch on the FI circuit breaker or line
protection
6.1.1 Behaviour of system after a power failure
When the power supply has been restored the boiler returns to the
previously specified mode and is controlled according to the specified
program.
EXCEPTION:
If the boiler was at operating status “Heating up”, “Pre-heating” or
“Ignition” it follows shutdown procedure and cleaning is started. Only
then does the boiler switch to “Preparation” operating status and the
system starts again.
6.2 Excessive temperature
The Overheat Thermostat stops combustion at a boiler temperature of
222°F (105°C). The circulators continue to run!
In case Overheat Thermostat automatically has been activated:
 Wait for boiler temperature to drop below 203°F (95°C)
 Remove cap of Overheat Thermostat (STL) by screwing-off counter-
clockwise. STL located at right hand side of Boiler Control System
viewed from front side of the boiler.
 Release STL by pushing button behind cap using a small screw driver or
ball point pen. Release was successfully, when fault is gone on display.
 Screw-on cap of STL again (clockwise).
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