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ERROR72 WATER TANK ROUTE occured. What should I do?

The water heating system is not functioning correctly
water heating device

  1. Turn off the machine off once and then turn it on again later
  2. Confirm the amount of mixed water (water with antifreeze liquid) in the water heating device and refill the mixed water if the level is low
  3. Confirm the cover of feed-water inlet and the air vent are firmly closed
  4. Confirm the environmental temperature is in specified temperature.
    Water can get cold before circulating if environmental temperature is too low.
    Available temperature: 15 to 35C (59 to 95F)
    Guaranteed temperature: 20 to 25C (68 to 77F)