So we have a heat pump dryer at home too , so after testing the pump by tipping some water in , see whether the pump worked , it didn’t but continuity was good on both pump and sensor, so id swopt the pump and sensor and float from mine , , it works fine, so now ive heat and a working pump, only downside to this parts swop is the float on my dryer is much smaller, so its either out with a hot knife to reduce the size of the larger float or buy a new one BUT finally i think ive cracked it….:)