IDEAL LOGIC + Combi 24 Installation And Servicing page 61

87 OUTsIDE sENsOR FAULT - CONTACT INsTALLER
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.
At 0 C expect
o
At 15 C expect
o
At 30 C expect
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?
88 NO WATER FLOW ThERMIsTOR FAULT - CONTACT INsTALLER
Is the wiring securely connected to the No Water Flow
Thermistor (located in the top of the Heat Exchanger?)
Disconnect the wiring from the No Water Flow Thermistor
Check the resistance using a suitable multimeter connected
across the Thermistor's terminal pins.
At 25 C expect
o
At 60 C expect
o
At 85 C expect
o
Is the Thermistor value correct?
Is the wiring securely connected to the low voltage 11 way
connector at the front left hand side of the PCB?
+
Ideal Logic Combi -
FAULT FINDINg
YES
31,000 - 35,000 Ohms
15,000 - 16,500 Ohms
7,700 - 8,500 Ohms
YES
YES
9,700 - 10,300 Ohms
2,400 - 2,600 Ohms
1,000 - 1,100 Ohms
YES
Installation and Servicing
NO
Securely connect the wiring at both the
boiler and Outside Sensor
NO
Fit a new Outside Sensor
Securely connect the wiring at the
NO
Terminal Block and the PCB
Replace PCB
YES
NO
Securely connect the wiring to the No
Water Flow Thermistor
NO
Fit a new Thermistor
NO
Securely connect the wiring to the PCB
Replace PCB
YES
61