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    AquaStar 240FX temperature surfing up and down

    Also, sorry for the double post. My first post disappeared so I reposted this one. Then both showed up... Thanks!
  2. D

    AquaStar 240FX temperature surfing up and down

    have an old Aquastar 240FX tankless water heater that has developed the annoying habit of "temperature surfing". Once the running water is hot and you're taking a shower, the water will get cold for a while, then heat up again. This cycle continues. The time between hot to cold to hot again is...
  3. D

    Help! Tankless water heater temperature surfing up and down

    Hi. I have an old Aquastar 240FX tankless water heater. The unit is old but mostly works OK. Lately it has developed the annoying habit of "temperature surfing". Once the water is hot and you're taking a shower, the water will get cold for a while, then heat up again. This cycle will continue...
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