Profitec Pro 500 PID: Check and Reset High-Limit Switches
If your machine is not heating up, resetting the high-limit switches may solve the problem. The high-limit switches can trip if a machine is turned on and there's not enough water in a boiler, causing it to overheat. If your machine's green and orange lights are on, and your machine isn't heating at all, it could very well be due to your high-limit thermostats. You have two on your machine's boiler.
First remove the housing on your machine
You'll want to tap the little black button a couple of times, and also make sure the wire connections are tight on the thermostats. Here is a video of this on a Pro 700. It will be laid out differently, but they use the same thermostats:
How To Reset High-Limit Switches on a Profitec Pro 700 Espresso Machine
If you tried resetting the high-limit, by tapping the small button in the center a few times, and it did not allow the machine to heat up, we recommend testing that high-limit switch to see if it's faulty.
Below is a video on testing the high-limits. This is shown on an Expobar machine, but testing a high-limit switch is the same on any machine:
How To Test Electronic Systems in Expobar Brewtus PID Espresso Machines
