Recent content by sybrmike

THANK YOU PS0303! I just installed the new board and that seems to have fixed the problem. Gonna let it run awhile & then cycle it a few times, but looks like it's hot tub time just in time for Memorial Day weekend. Thanks again.

I'm having problems with my 7 year old Mastertemp 400. After much searching I had found a previous thread describing my exact symptoms ,MasterTemp 400 Heater won't stay running, but it was never confirmed if a new control board solved the problem? The heater seems to be starting normally when...