Carrier 30gh hp trip

[acdoctor]

Old 30GH 160 carrier Chiller tripping on hp mainly overnight in low ambient, completely random
thermistors - all 8 read similar resistance
sometimes will trip on hp at start up after compressor runing for 10 seconds, thinking about changing hp switches
Any ideas appreciated

[Brian_UK]

How does the measured pressure compare to the sensor/switch pressure settings?

[icecube51]

is this a watercooled condensor? if so, maybey you need to clean it.
is there a watertower for cooling the conderwater, maybe you have to clean that one as well. tripping on high presure is normaly du to high temperature of the condenser.

Ice

[hemyfdo21]

what is the password york yaep 77 air cooled chiller

[james10]

It's a possibility that the discharge gas thermistors in the cylinder heads is causing the trip try linking them out

[Grizzly]

Icecube has the most logical options, which is where I suspect Brian was leading to.
James's suggestion is also valid if your chiller is fitted with the Low temp option. =(DGS).
If none of the above-
Also does your model have TEV's or liquid line valves.
Whichever is fitted the issue could be with them.
Check their operation.
Grizzly