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Combi boiler DHW too hot
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Cah283
Member Posts: 1
Hello! I have a UTICA CuB CCB 150 gas Combi boiler. For the past month the DHW has been extremely hot well above the 118*F the thermostat is set to. I replaced the control board, the DHW sensor, and the safety sensor but it is still very hot. Any ideas on what is causing it?
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Comments
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Is there a mixing valve on the boiler for the hot water? one like this? https://www.caleffi.com/usa/en-us/catalogue/mixcaltm-adjustable-thermostatic-and-pressure-balanced-mixing-valve-npt-521400a0
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You should have a anti scald / mixing valve installed in your domestic hot water line. That unit will and can vary temperatures between 104* and 140*.
Has the plate heat exchanger been cleaned annually?0 -
Who told you to replace the board. did you de-scale the heat exchancher?0
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Was it accurate when first installed and up until now? A new problem or condition?Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0
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