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Diagnostics
(continued)
Fault codes
(continued)
Fault code on display
F2
F3
F4
F8
F9
FA
FC
Fd
FE
FF
No fault code
displayed
*1
Control mode: Boiler/burner fully operational (fault code must be verified and reset).
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Burner blocked: If fault cause is corrected, burner resumes operation.
*1
System behavior
Burner in fault mode
Burner in fault mode
Burner in fault mode
Burner in fault mode
Burner in fault mode
Burner in fault mode
Burner in fault mode
Burner in fault mode
Burner blocked or in fault
mode
Burner blocked or in fault
mode
Boiler/burner in standstill
Cause
Fixed high limit switch open
(activated).
Flame signal already present
at burner start.
No flame signal
Gas valve closes too late
Fan speed too low during
burner start
Fan not at standstill
Gas valve faulty or faulty
modulation valve control; or
vent system blocked
Burner control unit fault
Strong interference (EMC)
field nearby or faulty main
PCB.
Strong interference (EMC)
field nearby or faulty main
PCB.
Flow switch open
Troubleshooting
Corrective action
Check heating system fill
level. Check the circulation pump.
Bleed air from the system. Check
fixed high limit switch and
connecting cables.
Press "
RESET".
Check the ionization electrode and
connecting cable.
Press "
RESET".
Check the ionization electrode and
cable, measure the ionization
current, check the gas pressure,
check the gas valve, ignition,
ignition module, ignition electrodes
and the condensate drain.
Press "
RESET".
Check the gas valve. Check both
control wiring/connections.
Press "
RESET".
Check the fan, the fan cables and
power supply. Check the fan
control. Press "
RESET".
Check the fan, the fan connecting
cables and fan control. Check the
fan control. Press "
RESET".
Check the gas valve. Check the
vent system. Press "
RESET".
Check ignition electrodes and
connecting cables. Check whether
a strong interference (EMC) field
exists near the equipment.
Press "
RESET". Replace control
unit if fault persists.
Restart the equipment.
Replace the control unit if the
equipment will not restart.
Restart the equipment.
Replace the control unit if the
equipment will not restart.
Check pump operation and flow
switch
59
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