Profitec Pro 400: Relay Upgrade Kit Installation

This guide will assist you in upgrading the static relay in your Profitec Pro 400 PID espresso machine. Upgrading to a new relay can improve reliability and performance.

Technical Skills

Basic familiarity with tools and electrical connections is required.

Tools Needed

• Allen wrench (included with kit)

• Sharpie (optional, for marking screw locations)

Associated Parts

• Static Relay Upgrade Kit (includes new static relay, double-sided heat transfer tape, Allen wrench, and wire ties)

Video Instructions

Below is a video outlining this process on the Pro 500. While it is a different machine, the process is extremely similar.

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Step-by-Step Instructions

1. Preparation and Safety

• Ensure your machine is unplugged and completely cooled down before beginning this procedure.

2. Removing the Housing

• Remove the housing from your Profitec Pro 400 PID.
  Note: This linked video demonstrates the process for the Pro 500, but the procedure is extremely similar for the Pro 400.
  How to Remove Housing on Profitec Pro 500 PID

3. Removing the Reservoir Housing

• Remove screws securing the reservoir housing.
  (Optional Tip: Use a Sharpie to mark screw locations to simplify reassembly.)

• Disconnect wires from the reservoir sensor:

  • Remove one wire from the top connection.

  • Remove the other wire from the bottom connection.

4. Removing Old Static Relay

• Locate the existing static relay (near the control box).

• Using the provided Allen wrench, remove the relay mounting screw.

• Disconnect the four wires from the existing relay.

• Completely remove the old static relay from the machine.

5. Installing the New Static Relay

• Note: You can connect the wires to the relay first or install the relay first. Do steps 5 and 6 in the order most convenient for your workflow.

• The Pro 400 will not require the extra wire included in the kit, as you are not relocating the relay as you would in the Pro 500.

• Prepare the new static relay by applying the provided double-sided heat transfer tape to the back of the relay.

• New orientation for installation:

  • Remove the tape cover from the relay.

  • Carefully position the relay inside the machine against the side wall (image below).

  • Press firmly to secure it in place.

  • Important: Due to this new alignment, you will not use the previous nuts and bolts.

       

6. Connecting Wires to New Relay

• Connect the wires securely in the following sequence:

  • Thick black wire → Terminal #1

  • Brown wires → Terminal #2

  • Thin black wire → Terminal #3

  • Red wires → Terminal #4

• Double-check each connection to ensure they are secure and properly attached.

7. Securing Wires

• Use the provided wire ties to neatly organize and secure the wires within your machine.

8. Reassemble Reservoir Holder

• Reattach the reservoir housing to its original location.

• Reconnect sensor wires to the reservoir sensor (wire order does not matter).

• Secure the reservoir holder screws using your previously marked locations.

9. Final Checks and Startup

• Inspect all connections thoroughly to ensure secure placement.

• Replace the outer housing and secure all screws and fittings.

• Once fully reassembled, plug in your Profitec Pro 400 PID and test its operation to confirm proper function.