The thermofuse was blown and a capacitor looked expanded on the circuit board. They wanted $157 to replace the fuse and said nothing about the capacitor that I pointed out to him. So I went to the electronic store, Mar Vac or Signal Electronics, and got the fuses for $1.60 each. Capacitor 70 cents. Had to drill out the old capacitor soldiering with a 1/32 bit and a Dremel drill. For all we know it was only the fuse. WHen soldering the fuse you have to use lots of heat sinks. The next fuse blew fast but we ran the heat dry mode which could have made it too hot but the thermostat measured the low end resistance as in the manual suggesting perfection. So we have the new fuse sticking out the front to keep cool, drilled holes for it to fit through and snap straight into place. Now it's working very good. However, I'm still going to layer some fiberglass insulation between the circuit board and the washing machine to keep it cool. Many have suggested replacing only six inches of new "harness" which really means the connectors are discoloring and corroding with no recall campain.

I have measured a total of 12 amps on these Whirlpools with the motor and heater on at the same time. If the inlet water is too cold, the heater will be on longer to heat the water and could extend into the motor start up period. The high starting current combined with the heater will sometimes blow the fuse.
Usually raising the inlet water temperature will solve the problem unless there are other problems with the heater circuit.