carrier freeze protection fault

[stormfan]

Hi All,

I have a carrier twin screw aircooled chiller that keep failing on freeze protection at night when it has no run command.

Any ideas of what could cause this fault?

[Brian_UK]

What is the nighttime ambient temperature?

Have you checked the setting/operation of the fluid low temperature switch?

[redroge]

Are the pumps running at night

[stormfan]

the night ambients are always above 0 degrees and the problem happens all year round when the overnight temp would be above 10 degrees

[stormfan]

the chiller has onboard pumps so I dont think they run at night.
I removed the plug for remote running of the chiller so it did not get a call to run from anywhere.

[AlexG]

Chiller must have "black box" in its controller. can u check data at moment of fault?