Compool 3600 inside panel push any button it will show on then off.

Control board is likely shorted out and needs to be replaced.

check to see if relay is bad

turn power off the nremove front cover the filter relay should be #1 position if not sure look at auxilarries and follow the red and black wire from filter to the relay why do you need to know?

when the indoor control start the alarm , did you notice any error code display in indoor control like 170 ? POSSIBLE IS THIS control a pool only or pool and spa combination, did you have a pool heater connected to compool 3400 (PENTAIR)

need more info are you looking for location if its showing shorted or over 104 degrees its bad look for it connected to plumbing after the pump the other side goes to the PCB board

The first thing that I see is if you have a service panel, make sure that it is in "auto", not "service" and that all switches are set to off. That is the panel by the pool/spa, not the main panel.
Gary

Turning on the spa side remote will remove the error code.Pentair will send you a new manual if you ask for one.

Do not reset while the motor is running. Reset the CP 3600 when the power is on but with the motor off. OK.