54516-02 - Balboa..GS501SZ Circuit Board ..pump 1 - dual speed , blower/pump 2 , ozone , light +...

Balboa GS501Z Circuit Board PCB (55447-01) Canadian Spa Co. Hot Tub / Spa Part

This is a Canadian Spa Co. Marked part and is only to be used in conjunction with there matching Topside Control 

Mode 501SZ tech sheet

Mode is changed by pressing   Warm or Cool, then pressing Mode

STANDARD Mode maintains set temperature. 
will be displayed momentarily when you switch into Standard Mode.

ECONOMY Mode heats the spa to the set temperature 
only during filter cycles.  will display when water temp is not current, and will alternate with water temp when the pump is running.

SLEEP Mode heats the spa to within 10°C/20°F of the set temperature only during filter cycles.  will display when water temp is not current, and will alternate with 
water temp when the pump is running

Works with VL404, VL701 topsides 

does not work with VL200 or VL260