Balboa BP501G1 BP501 X Circuit Board PC Board, Balboa, LPI501ST, (2) Pump System, Energy Saver ,480 0152, 56705 Balboa BP501G1 BP501 X Circuit Board VS501Z Balboa Circuit Board 54357 Z 54357 01 VS501SZ. 55447 Balboa.. CPGS501z Circuit Board KK 10287 Mode 501Z Depending on system configuration, mode changing may not be available and will be locked in Standard Mode. Mode is changed by pressing Temp, then Light. 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 10C 20F of the set temperature only during filter cycles. will display when water temp is not current, and will alt 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 10C 20F 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