carel pboohoo controller alarm

Hi everyone hope you can help with this little problem.Controller keeps going into alarm which also turns off evaporator fan.with the alarm set at 5c and the cab temp at -6c it still goes off and shuts off the fan.any ideas folks. Thanks

low temp alarm set at?

Low temp alarm set at -25c

intermittant faulty probe perhaps? going out of range but not enough to alarm on probe error

Hi. doormaster2008.
Just a guess but if parameter A4 is set to 9.
Then you may have an issue with the door switch?
Worth checking anyways!
Good Luck.
Grizzly

Thanks guys.will checm them out.it seems strange if i switch mains off when in alarm condition when i switch it back on it will work for hours with no problems.

Seem to recall there are 2 types of alarm setpoints.

Absolute where the temp (high and low) are the actual alarm threshold parameters.
Relative where the alarm (high and low) are, well, relative to the setpoint.

So if you are set for 1*C relative points of AL=5 then the alarm will come on at -4*C. If you have it set for -5 the it comes on at 6*C.
A1=0 is relative
A1=1 is absolute

If AL or AH =0 then the alarm function is turned off.

Not sure about the evap fans going off mind and if this is the alarm then you get AL or AH flashing up I think. When power is reset then you need to wait for the alarm delay before it alarms again.

Carel, gotta love them. More settings than you can shake a stick at. Stick in an Elliwell. :-)

Your not wrong there Taters.if the slot was'nt so long it would have an elliwell on it.dont know why they have to make everything so complicated.I cant understand why the fan stops.the alarm triangle and the cabinet temp readout flash on and off.I hate Carel.

Hi doormaster2008.
I agree Taters is more likely to have sussed your problem.
Do you need a manual or have you one?
Grizzly