the clothes keep shrinking on a 40 wash and the water comes from the boiler already hot so i dont know if the thermostat is broken and it is washing them hotter because its not putting the right temp in
depending on your washing machine it will either skip the heat up part or just continue to boil if it just keeps boiling or skips the heat up part its the thermostat (if its on hot+cold water fill it wont mix the water correctly and will get too hot and shrink your clothes) one way to test it is take off the hot water inlet hose and see if it fills with cold water then see if it heats the water up or gets stuck that will tell you if the thermostat sensor is at fault)
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