I hate to necro such an old thread, but I had to give you props uncle_bob! Quoteuncle_bob If your thermistor reads 13.5 ohms at room temperature, either it's very much the wrong part or your wires are shorted. Try: 1) Measure a known good resistor with your ohm meter to check it. Best to try something in the 50K to 200K range. 2) If your wires are cable tied down, undo the cable ties. Remeasuby iancaz - Reprappers