Outside Sensor Fault; No Ch Operation - IDEAL LOGIC+ SYSTEM2 S15 Installation & Servicing

4.10 OUTSIDE SENSOR FAULT

Is the wiring securely connected at both the boiler and
Outside Sensor?
Disconnect the wires to the outside sensor.
Check the resistance using a suitable multimeter
connected across the Outside Sensor's terminal pins.
Temperature
0 C
o
15 C
o
30 C
o
Is the Outside Sensor value correct?
Is the wiring securely connected between the
incoming terminal block boiler connection of the
Outside Sensor and the PCB?
Replace PCB

4.11 NO CH OPERATION

Is "Off" shown underneath the rad on the display?
Are CH Timer and Room Thermostat switched on?
Are the Radiator Valves Open?
Is there 230Vac at SL2 IN?
If an OpenTherm Room Stat is not connected, is there
a link wire across the OpenTherm connections (B)?
Is an Outside Sensor connected?
Check wiring from terminal strip to PCB
Installation and Servicing
Section 4 - Fault Finding
YES
Resistance kΩ
31.0 – 35.0
15.0 – 16.5
7.7 – 8.5
YES
YES
NO
YES
YES
YES
YES
NO
NO
Securely connect the wiring at both the
boiler and Outside Sensor
NO
Fit a new Outside Sensor
NO Securely connect the wiring at the
Terminal Block and the PCB
YES
Press Mode button (B) until "Off" not shown
NO
Switch CH Timer and Room Thermostat On
NO
Open the Radiator Valves
No voltage from Timer/Room Stat.
NO
This is not a boiler fault.
Ensure voltage is supplied to boiler by rectifying
external wiring.
Connect a link wire across the OpenTherm
NO
connections.
YES
Ensure that there is 230V at SL1 (IN)
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