108
16
FAULT CODES, BLOCKING CODES
16.1
Fault codes
IMPORTANT:
To avoid electric shocks, disconnect electrical supply before performing troubleshooting.
To avoid burns, allow the unit to cool before performing troubleshooting.
Be aware that a fault code is an indication that the unit or the system needs attention.
When repeatedly having faults, these should not be neglected.
The first step is to check if the unit is installed according to the instructions. If not, first
make sure the installation complies with the installation manual.
Always check the fuses on the control board before replacing any major components. A
blown fuse can prevent the controller or other components from operating.
Most faults can also be caused by a bad wiring and/or connections, even if it is not spe-
cifically mentioned. With every fault, it is wise to check wiring and connections (at both
ends) that connect to the safety device/component that generates the fault.
LOCK-OUT CODES:
Having a lockout means that the boiler needs a manual reset to start operating again.
When the boiler is in lockout the backlight of the display is blinking on and off.
Explanation >
9 9 9 , 5 : h r s
= time elapsed after fault/mes-
sage.
Explanation >
P u m p 1
o n
= status of the pump during fault.
Display message
F15
C l
i x o n
F a u l t
p u m p
o n
9 9 9 , 5
h r s
Reason:
Heat exchanger fuse exceeded maximum value.
Cause:
The thermal fuse of the heat exchanger has opened permanently.
Corrective action:
Switch off the electrical power and gas supply and contact supplier.
Display message
F18
A P S
s w i
t c h
p u m p 1
o n
9 9 9 , 5
h r s
Reason
Air pressure switch activated for a certain time.
Or combination of NRV blocking and an F11 lock-out.
Cause:
The fan of the non-burning burner is not able to run to prevent recirculation.
Check the 4-wired wiring and connections at the fan and at the main control board.
Check the 3-wired power supply wiring and connections at both ends.
Replace the fan.
Replace the main control board of that specific burner.
Cause:
It is not certain that the non-return valve of the burner, that is not burning, is closed.
Corrective action:
Check the state of the Non-Return Valve:
> Is the valve moving freely to the open and closed positions.
> Is there debris/fouling or corrosion in the valve to prevent the valve to move freely.
