36
3060918_1203
Troubleshooting
Fault
Cause
Remedy
Burner does not start or
enters a fault state
No voltage present at the
control unit
Fuse, electrical connections,
Check the position of the ON/
OFF switch and heating sys.
emergency stop switch.
Oil tank empty / Gas supply
line shut off
Fill oil tank /
Open gas supply line.
Burner fault
Press the reset button at
burner control unit
(see burner installation
instructions)
Safety temperature
Press the reset button at the
control cut-out activated unit.
Oil filter clogged
Replace oil filter.
Heating circuit pump does
not start
System in summer mode
Check summer/winter switch
position.
Heating circuit pump locked
up
Turn the pump shaft with a
screwdriver.
Heating circuit pump faulty
Replace the heating circuit
pump.
Cylinder loading pump does
not run
DHW cylinder thermostat
faulty
Check DHW cylinder thermo-
stat and replace, if necessary.
Cylinder loading pump seized
up
Turn the pump shaft with a
screwdriver.
Cylinder loading pump faulty
Replace the DHW loading
pump.
Heating system operational,
but room temperature too low
Adjust maximum boiler tem-
perature set too low.
Raise maximum boiler tem-
perature.
Heat-up takes too long
Heating water temperature
too low
(check at DHW cylinder flow,
not at the boiler)
Raise the temperature
(adjust thermostat)
Too little heating water
(creates wider spread, i.e. return
temperature too low)
Install larger DHW cylinder
loading pump
Indirect coil not vented
Vent indirect coil with loading
pump OFF
Indirect coil scaled up
Descale indirect coil
DHW temperature too low
Thermostat switches OFF too
soon
Adjust thermostat
Return temperature too low
(e.g. spread too wide)
Return temperature too low
(e.g. spread too wide)