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Remove heater block thermistor

Posted by ahbtsang

ahbtsang

Remove heater block thermistor
November 21, 2012 03:16PM

Registered: 12 years ago
Posts: 119

What would be the best way to remove the thermistor which is stuck inside the brass heater block? The 2 connectors from the thermistor both came off and it is impossible to weld them back because they are just too small...

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jamesdanielv

Re: Remove heater block thermistor
November 21, 2012 04:01PM

Registered: 13 years ago
Posts: 1,797

the thermistor should be replaced. solder will just melt, and copper wire will oxidize and only give you a single reliable run.

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ahbtsang

Re: Remove heater block thermistor
November 21, 2012 04:15PM

Registered: 12 years ago
Posts: 119

Thanks, that means I need to replace the block (brass block + resistor + thermistor)?

Right now, both the thermistor legs came off and leaving just the glass bead inside the brass block with a bit of fire cement. I am thinking whether it is possible to clear it out, otherwise I would just buy a thermistor and drill a hole next to it. smiling smiley

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james glanville

Re: Remove heater block thermistor
November 21, 2012 06:18PM

Registered: 15 years ago
Posts: 332

You can just drill the thermistor out, and then you get to keep the brass block and resistor. Drilling another hole might be just as easy. I use exhaust putty to hold my thermistor in place, and it has the advantage that you can blob it all around the cables for a little strain relief.

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ahbtsang

Re: Remove heater block thermistor
November 21, 2012 06:55PM

Registered: 12 years ago
Posts: 119

thanks. does exhaust putty conduct electricity? Is there anywhere I can just get a tiny amount? or what other materials will be good for this purpose?

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ttsalo

Re: Remove heater block thermistor
November 21, 2012 07:08PM

Registered: 12 years ago
Posts: 313

High temperature silicone sealant works well too. "Silcoset 158" is what I use. It's non-conductive so there's no risk of shorting the leads to the block.

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jamesdanielv

Re: Remove heater block thermistor
November 22, 2012 04:51AM

Registered: 13 years ago
Posts: 1,797

no the exhaust putty does not conduct electricity. it is boron silicate. it is a high temp glass, it is the same thing used for rope glue as well, just the exhaust repair kits are cheap and include an ample supply.

Edited 1 time(s). Last edit at 11/22/2012 04:52AM by jamesdanielv.