What would cause a PID temps to jump around?

[pretzelb]

A bit frustrated right now because my mash water is now 158 when I was shooting for 152. I actually set the temp for 148 and I was going to ramp up from there but after it hit 148 as soon as I started to bump up the temp the probe readout jumped all around until finally settling on 161. I confirmed the temp with a Thermapen. So while I thought I was heating to 148 it actually went to 161 and now I have to wait for it to cool before I can mash.

Any idea what would cause the PID to jump like that? Should I replace it or look for a wiring issue?

 

[doug293cz]

Most likely an issue with the temp sensor wiring - perhaps a bad solder joint, or loose connection. What type of sensor are you using? Do you have connectors in the sensor circuit?

Brew on

 

[augiedoggy]

Dejavu? Or there's another thread from last week on this exact topic?

 

[passedpawn]

If you have connections, they are likely oxidized. Spray some electrical cleaner (de-oxidizer) on both male and female connections. I recommend DeoxIt (Amazon). I use it for all sorts of stuff like this. Magic. https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias=aps&field-keywords=deoxit

 

[pretzelb]

Most likely an issue with the temp sensor wiring - perhaps a bad solder joint, or loose connection. What type of sensor are you using? Do you have connectors in the sensor circuit?

Brew on

Hey Doug,

I bought the system finished (I didn't build it) so I'm not entire sure but I think it's an Auber SYL-2362B. I could take a picture of the connections if you think that would help.

 

[doug293cz]

Hey Doug,

I bought the system finished (I didn't build it) so I'm not entire sure but I think it's an Auber SYL-2362B. I could take a picture of the connections if you think that would help.

It can't hurt.

Brew on

 

[BrunDog]

House of Pain?

Kidding. See above. Eliminate any/all terminal connections where possible. RTDs should be directly wired to the PID.

 

[augiedoggy]

Maybe this thread from last week will help...
https://www.homebrewtalk.com/showthread.php?t=637844