Being a primary stockist of Balboa in the UK, we try to carry all the little parts which you may need in an emergency - below is a selection of hot tub specific fuses, with differing rating and uses.
Light Transformer slo blow fuse (s/n 20597) - 1/2 amp
Spa Light fuse (s/n 20600) - 3 amp
Blower fuse (s/n 30122) - 10 amp (30122 is generally used on the older boards with 26904 used on the newer models such as BP2100/601, etc)
Pump 2 fuse (s/n 30123) - 20 am