Chamber heater wiring problem
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Ah, thanks, I'll switch to M307.
It's in the error state immediately as i power it on. No change if I swap to the other extruder thermistor connector. I did execute X3 on the end of M305, which got me a temp display pegged at 88c, it doesn't really move.
M305 P2 T100000 B3974 R4700 H30 L0 X3
But X3 must not be right.
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Did you try plugging the bed thermistor into the E1 connector as I suggested? This would tell us whether it it the thermistor that is at fault.
In the error state, what is the temperature reading?
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I did, infact I tried a spare thermistor, then I tried with a new thermistor plugged into the spare channel so that it had a thermistor in each channel. Then I swapped them around. No such luck.
Did you try plugging the bed thermistor into the E1 connector as I suggested? This would tell us whether it it the thermistor that is at fault.
In the error state, what is the temperature reading?
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And the temperature reading?
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And the temperature reading?
I don't get a reading, it just says "error", unless I use the X3 parameter, in which case I get 88
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It's been a while since I tested the chamber heater support, so I'll re-test it.
You could a!so try plugging the thermistor into the E0 thermistor connector and using X1 in your M305 P2 command.
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That also gave me an error state with a large negative temperature. I'm wondering if the combination of the first hotend temperature control using a PT100 is a factor?
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Use of a PT100 for the hot end shouldn't affect the availability of the E0 and E1 thermistor inputs.
Perhaps you have a bad crimp connection on the thermistor? As you have a known working bed thermistor, try plugging that into the E0 or E1 thermistor connector, and your other thermistor into the bed thermistor connector, to see what readings you get.
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Thanks! That was exactly the suggestion I needed to figure it out. Turns out the 5 thermistors I have on hand that came with connectors pre-crimped, something is wrong with them. None of them give a temperature reading, but plugging in the bed thermistor gives a sane chamber reading. Obviously that means something is wrong or unknown about my spare thermistors. An ohm meter also doesn't give a reading with them. Must have got a bad batch.
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yup, all 5 crimped onto the insulation instead of bare wire, by the supplier.
