No Dhw Operation; No Display - IDEAL LOGIC+ SYSTEM2 S15 Installation & Servicing

4.12 NO DHW OPERATION

Is the Cylinder Stat calling for heat?
Is DHW timer on?
Is OFF shown under Tap symbol?
Is there 230V at SL2 IN
Is an Outside Sensor connected?
Check wiring from terminal strip to PCB
FROST STAT
OPTIONAL
OOM
MAINS IN
TAT/
IN OUT
MER L N

4.13 NO DISPLAY

Is there 230Vac to the boiler at L and N?
Is the wiring from the terminal block to the PCB
connected securely?
Replace the PCB?
54
YES
YES
NO
YES
YES
SL2
IN OUT
SL1 MAINS IN
L N
YES
YES
Section 4 - Fault Finding
NO
Adjust cylinder stat
NO
Switch timer on
YES
Press mode button until OFF is not shown under the
Tap symbol
NO
Check system controls and wiring
YES
Ensure that 230V is not connected to SL1 (IN)
OPEN THERM./
WEATHER COMP.
B
L
N
NO
Supply power to the boiler
NO
Connect the wiring from the terminal block to the
PCB securely.
Installation and Servicing