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Fault
Burner does not start
or enters fault state
Heating circuit
pump does not start
Cylinder loading pump
does not run
The heating system operates,
but room temp. too low
Troubleshooting
Cause
No voltage present
Oil tank empty /
Gas supply line shut off
Burner fault
High limit safety cut-out
has switched OFF
Oil filter clogged
System in summer mode
Heating circuit pump locked up
Heating circuit pump faulty
DHW cylinder thermostat faulty
DHW loading pump locked up
Cylinder loading pump faulty
Maximum boiler temperature
set too low
Remedy
Check fuse, electrical connections, position of ctrl.unit,
ON/OFF switch and heat. system emerg. stop switch
Fill oil tank /
Open gas supply line
Press the reset button at the boiler control unit
(see burner installation instructions)
Press the reset button on the control unit.
Replace oil filter
Check summer/winter switch position
Turn the pump shaft with a screwdriver
Replace the heating circuit pump
Check the DHW cyl. thermostat and replace, if nec.
Turn the pump shaft with a screwdriver
Replace the DHW loading pump
Raise maximum boiler temperature.
17
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