Ultimate PID Gaggia Classic Pro Mod 

By far the best video to explain it step by step with electrical diagram! So informative! Thank you!

Thank you for putting this video together!

Thanks for posting this, I bought all the parts from AliExpress, did most of the wiring ahead of time and installed it using the diagram.

That’s awesome explanation and diagram Thank you!

Such a detailed video. Cant wait to try ✌️

Very detailed video, thanks so much for putting this together! Going to order the parts off Ali soon and shop the rest locally.

Thank you so much for sharing!

Thank You!! I completed everything today: cut opv spring, lamp dimmer switch on right side in front of steam knob, installed manometer on front right, moved Gaggia logo left, setup xmt7100 for 2 relays, pulled a perfect shot, and I now know the pressure is at 8.5 bar. You helped a lot!

Thaaaank you for the video

Thank you soo much

If you ever do a water tank light upgrade a video would be most useful! Great vid!

Thanks, that took about 2.5 hrs do do glad you included the programing commands or I would have been a week figuring out that part of it. With the power wire to the pid connected to the left most switch it stays on constantly, if you want it to go off connect to the center switch top left most terminal. Works great! Question, does it adversely effect the steamer?

Hi. Thank you for the vid. Very clear instructions. Just need to confirm the pid settings. Do you enter all those values manually? Or do you just set the temperature to 103 and start the autotune? When you brew to you enter the lower temperature - ie 93 or 94c (the desired temp for most coffees)? Thank you so much.

Nice vid. Awesome. Do you have a diagram for double SSR setup? As in to control AL1 and AH1 for steam temp purpose

Currently printing the housing for the PID.. How exactly do you program it? Would be nice to see a video on how to. Thank you for the detailed instructions!

Hi, I followed this guide also and it works perfectly!👏🏻👏🏻 thank you :) do you know how I can add a second o e to stabilise the steam setting as well? I’d love to upgrade it for this last part also?

Thank you Ewejin. Wondering if there’re diff pid module available in the market? It’s interesting to see how flow rate can be controlled too?

Nice tutorial. Now i waiting part to start the upgrade. If u dont mind where u get the opv. I got 1 source but unable ship to Malaysia 😂

Nice job

Thank you Ewejin for your very informative and detailed video. I am not good dealing with electrical values, will this set up work as well in the USA model since we have 110v and not 220v like in Europe or I will need to change some components or the way it is connected?

what a great guide. Which kind of terminal I can use instead of piggy back ones? I am asking that because, I am not able to easily find ones without purchasing 100 units. Thanks

The IntY should be PT10.0 , not PT100. The other video by Damion has it written wrong even though that's what both you and him have configured. That's how you get the decimal point. Great video though, did the mod this past weekend and machine works great now. The first few shots before correcting that setting were too acidic but should dial in perfectly now.

Thank you so much for the video. May I ask how long did it take from start up until the temp reach 93 degree celsius?

Great tutorial, thanks for sharing your experience. I have a question. I noticed that you connected the cable with the piggyback terminal to the power on/off switch of the Gaggia, instead of the brew switch like Robert did it in his video. Why? And what's the difference between both choices? Thanks!

Thanks for the video, I wasn't sure how to wire the 3-wire temp probe. It looks like you modded your OPV to make it adjustable? I made a threaded sleeve for mine.

Great tutorial! Thanks. I followed it and installed the very same components on my 97 Gaggia Classic. However when brewing the temperature goes from the target 103C down to 99/98C. Weirdly, the autotuning last only for about 2 minutes. I tried several time with auto tune as well as manually setting the parameters but nothing helped. Do you have any idea of what could be wrong?

Great tutorial Ewejin. What is the difference between the 40amp SS relay and the one in Damian’s video (was 25amp)? Thanks

hi bro, shouldn't power supply socket be going into positive terminal 1?

thanks for the instructional video. question., i will need to buy a crimping tool for the project, what is a good crimping tool that you would suggest that is for a hobbyist, only doing occasional wire work. can you provide a link, thank you.

Thank you so much for this "how to". I did this PID mod with single SSR ( Brew temp only ). I have question, is it safe to use the steam switch? Does the steam temperature has its maximum to stop heating? Because we cannot control the max steam temperature on the PID with single SSR. What happen if i swtich on the steam but did not use the steam? Will the boiler gets broken? Or it will just stop heating the boiler at certain temperature?

Superb video. I assume that 9 and 10 terminals of the PID are DC and if so what voltage? Thanks in advance.

Love this video. Are you Malaysian? Quick question, are you planning on doing a flow control mod?

I like the white led lights, do you think I can just swap the PID with the mrshades? or are they not same

Have you done dual SSR?

Hello, I have noticed that you opted to use 40A SSR, while Robert uses 25A SSR in his installation, where is the difference coming from? Thanks for great video!

Thanks for the post. About the PID setting, at code 89 #3 HY=000.3 and #4 PSB=000.9 . How do you set the decimal, is the 0003 and 0009 is the same. Cant set to 000.3, and 000.9. How to get it there. Thanks Eddie

Hi there! Sorry I am a little bit confused as to what can the PID do, and I was hoping you could help me out. does the PID setup you provided control both Brew & Steam temperature? Or does it control Brew only? I saw at 08:35 for the PID settings you mentioned "Only if you have dual SSR" setting. What does Dual SSR's do? does it help with Steam temperature consistency? Hope you can shed some light on this, thanks!

There are two types of temperature sensors, M4 and M6, which one is them? Thanks for this video😁

Hi Evejin, thanks for all that instruction , it was really helpfull. After setting pid parameters, pid aut light doesnt turn off and it does not heat boiler for brewing mode. When i turn on steam mode, i see the temp is increasing though. What do you think is the problem ? Thermal sensor itself or connections of it ? Many thanks in advance

Hi Ewejin, thank you for the great tutorial. I have the same PID controller, but I’m not getting the temperature in decimals e.g. 102.5, 102.8, 103.1 instead I get 102, 103, 104, the temp reading increment is by 1 degree. Do you know why? Is it because I am using a K type temp sensor and not PT100?

I hope to find a used Gaggia in decent condition, because I don't want to buy a new one and void the warranty. Hi, thanks for a good DIY video, can you link to all the Connectors you need on aliexpress, I only find kits of 280-300pcs a $20 and so many are not needed.

Hi EjT: i saw your OPV in the video. is it an adjustable valve? May i ask where did u buy it?

Hi ! Would it possible to just piggyback the L and N wires from the power supply? Instead of taking a wire from the on/off switch and a wire from the neutral line from the power supply. Thank you so much for replying ! By far the best guide seen on youtube, cant wait to install mine

Do you need 2 relays if you want to be able to adjust the steam temperature?

hi ewejin i made the mod as directed. i see the pid is set at 103, i assume thats celsius. but when i take the temperature of the water as it goes into the cup it is 65 degrees celsius for me even though the pid is saying 103-106. what is the explanation for this? also what is the advantage of manually tuning the pid as opposed to autotuning?

Hi there, I wonder if you've corrected the IntY parameter from PT100 into PT10.0? If it's done, what value have you set up for PSb (pVbias = Temperature Sensor Correction)?

I ended up buying almost everything on the list except for the 2.5mm wires. Could you send an amazon link to some that I could buy? I'm not exactly too sure what to get!

Hi! Does this one works for the steaming temperature? I want to stop losing pressure while steaming, so I'm looking for a PID. But I don't know if this set up and this installation will work!

Hi will this mod work on my Gaggia Classic 2006 they all seem to be on Classic pro great video regards Carl

Hi, I just installed my xmt 7100 with single relay, for brew temp only. I am trying to get it to autotune. My understanding from the manual and some searching is it should complete the auto tune process relatively quickly, 15 minutes or so, but it just keeps flashing / staying in autotune. Am I missing something? I thought it would auto tune till it dialed things in and then exit autotune, do I have to do something manually? Thanks for the help.

What is the difference between installing one or two SSR? Thanks!!

I installed according to directions but when I turn on my machine the temperature for the PID only shows low 90s in F setting and moves very slow. The AT light is blinking slowly. But the machine is very hot

Bro, did you use 20awg size all throughout or you used different sizes? Shades is using 14awg and 22awg

Is that 1/8" hole your drilled? Guessing you're using metric system... Ordered all the parts off ali last night for $40, sure beats $150 - 200!

I did all the steps as stated. Could you possibly please help me why my temp keep dropping during autotune? Is it normal?

Hi, I set up my PID the same with yours except PT10.0 as comments. My steam is not working since the temp doesnt reach high enough. How do I set up to let steam reach higher than 103?

Dude - I feel like this is going to be a really dumb question - but is the wire I am looking for - 2.5mm single core, copper insulated wire?

My kit has second relay for steam. Have you installed this?

Hi. I did PID too but now my steam wand doesnt steam. Hot water still goes through the steam wand. Do you know what may cause the issue? :(

Sorry if I missed it but what happen to the Bezzera BZ13

fyi, in your graphic, in the 036 menu you have a typo, i as 00075 instead of 0075

Before doing all this, has anyone looked into swapping another thermostat for higher temps/ better temp swings?

can you link the 2.5mm wires you used

Will this do automatic pre-infusion?

Shopping for a sensor, I see some have 2 conductor wires and some have 3 conductor wires. What is the difference?

The pid works as soon as I connect the electricity, even though the machine switch is turned off

My PID does not light up, i test terminal 2 and there is power. Can you help[?

bro, is that an adjustable OPV?

XMT7100 seems to be no longer available. Are there any alternatives?

It seems I'm the only one for whom it didn't go well 😅 I did buy exactly the same parts as in the video and was careful to follow the steps exactly as in the video. Once the job was done, when I connected the power cable to the electricity, there was a short-circuit, the circuit-breaker blew and there was smoke at the PID.... After undoing everything, the machine is still working, fortunately, and it seems to be the PID that took the blow. Although I'd be surprised if I'd reversed any wires, do you know what could have caused the short circuit? I think the PID is now defective and I need to buy another one to proceed? Also, I noticed that the upper front connection of my machine is not exactly the same as in the video. On my machine, two wires are connected to the power supply, only one wire is connected to the left for the boiler and only one wire is connected to the left for the steamer. Is this normal and could it be the reason for the short circuit? Thank you very much for your help 😁

Hello friend! PSB should be 000.9 or 000.0?

how do i set 000.3? cant this here nor in damien’s video

3:35 anyone know which glue is that?

Are you using a dark roast for coffee? 103 is giving me very acidic shots, I may bump it up to 106.

Have you tried the Gaggia mod?

i wanted to do this mod for an christmas present and wanted to add an important note about the SSR. the SSR linked in the video had an estimated 2-3 month delivery time which I didnt want to wait for so i shopped around for another SSR on aliexpress. SSRs have an input voltage type AND an output voltage type. make sure to get an SSR that has a DC input and an AC output voltage! the model you will need to search for is SSR40DA. note the suffix letters D and A. the D is for DC input voltage and the A is for AC output voltage. do NOT make the mistake i did any buy an SSR40AA. i was excited to install everything and test. got it all hooked up and found out my relay wasn't engaging the boiler because the PID sends an output of 11-12 DC volts to the SSR and my SSR only accepts AC voltage. this is the alternate seller i used www.aliexpress.us/item/3256802663181474.html?spm=a2g0o.order_list.order_list_main.5.21ef1802nlE0vk&gatewayAdapt=glo2usa&_randl_shipto=US aside from my mistake, great video and thanks for creating this! your video was almost 100% spot on for my gaggia. the only thing i had to change was switch my positive PID piggyback connector to the bottom prong of the rocker switch instead of the top. just something for others to look out for when they do this. you WILL need a multimeter to test continuity and voltages as apparently not all Gaggias are made exactly the same and perhaps a little bit of electrical experience to troubleshoot if something doesn't work after completion

Hello! from the left button (power on) is "+"? from the power on the rear panel is it "-"? Why are two wires connected on the middle button (turning on the pump)? "+" can be taken from the middle button?

Why tune a PID?