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Fault Cause Remedy
Burner does not start No voltage present Check fuse, electrical connections, position of ctrl.unit,
or enters fault state ON/OFF switch and heat. system emerg. stop switch
Oil tank empty / Fill oil tank /
Gas supply line shut off Open gas supply line
Burner fault Press the reset button at the boiler control unit
(see burner installation instructions)
High limit safety cut-out Press the reset button on the control unit.
has switched OFF
Oil filter clogged Replace oil filter
Heating circuit System in summer mode Check summer/winter switch position
pump does not start
Heating circuit pump locked up Turn the pump shaft with a screwdriver
Heating circuit pump faulty Replace the heating circuit pump
Cylinder loading pump DHW cylinder thermostat faulty Check the DHW cyl. thermostat and replace, if nec.
does not run
DHW loading pump locked up Turn the pump shaft with a screwdriver
Cylinder loading pump faulty Replace the DHW loading pump
The heating system operates, Maximum boiler temperature Raise maximum boiler temperature.
but room temp. too low set too low
Troubleshooting
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