Thermistor NTC sensor for Sime Combi Boiler

[gilera]

Hello to all,
Can someone please tell me if a thermistor should read the same in and of circuit? I am getting correct figures from stat with it disconnected (12k to 1k ohms)but when connected it reads zero ohms. Across the connector for sensor on pcb it reads zero.

 

[Crinkmeister]

My guess would be that there is a fault on the pcb. A thermistor is just a resistor that changes its value with temperature. Can you measure a new pcb to compare?

I assume when you measured pcb, it was powered down?

 

[PlumbBobBob]

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