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Can anyone tell us what is NTC?

Valiant Boiler on the wiring.
Daniel Clarke, November 2006
it is a negative thermal resistor used for measuring heat. as the heat increaes the ohms decrease

rob, October 2009
IT STANDS FOR NEGATIVE TEMPERATURE COEFFICIENT, IT IS BASICALLY A RESISTOR THAT ALTERS RESISTANCE AS IT HEATS UP THUS ALTERING THE GAS PRESSURE.

BG MIKE, November 2006