IDEAL LOGIC + Combi 24 Installation And Servicing page 60

85 FLOW ThERMIsTOR FAULT - CONTACT INsTALLER
Remove the Flow Thermistor from the CH Flow Pipe
and disconnect the wires.
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 there continuity between the PCB and the Thermistor?
Replace PCB
86 RETURN ThERMIsTOR FAULT - CONTACT INsTALLER
Remove the Return Thermistor from the CH Return
Pipe and disconnect the wires.
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 there continuity between the PCB and the Thermistor?
Replace PCB
60
FAULT FINDINg
9,700 - 10,300 Ohms
2,400 - 2,600 Ohms
1,000 - 1,100 Ohms
YES
YES
9,700 - 10,300 Ohms
2,400 - 2,600 Ohms
1,000 - 1,100 Ohms
YES
YES
NO
Fit a new Thermistor
NO
Check and replace wiring as necessary
NO
Fit a new Thermistor
NO
Check and replace wiring as necessary
+
Ideal Logic Combi -
Installation and Servicing