Pesky P201 Code

On 30RA to 30RB, this code can be a massive headache. With all the different options for these chillers can come with this alarm can send you down many different paths. We will break down a couple of basics to look at first to get the chiller back online. If this code still presents the chiller will not run.

The P201 Code read out is “Cooler Flow/Interlock Contacts Opened During Normal Operation”. This alarm is from the flow switch losing flow while the chiller has a run command active. This is the main safety for the water side of the chiller. This stops the chiller from freezing the evaporator barrel. This is why you never jump the flow switch on any style chiller.

If the alarm is still present, replace the sensor – especially if it has been in the machine for a few years at least. Once all this has been checked, make sure you don’t have an external flow from the BAC. If that is all good hit the switch and fire the chiller up. These are some good steps to keep when checking water flow issues.

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