Daikin Altherma EHVH/X16S18+26CA User Manual (English)

Questions and Answers:

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Kara MarshallAug 17, 2025
What to do if the compressor does NOT start on my Daikin Altherma EHVH/X16S18+26CA?
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  smithtamiAug 17, 2025
  If the compressor on your Daikin Air Conditioner doesn't start, it could be due to several reasons. If the water temperature is too low, the unit uses the backup heater to reach the minimum water temperature first (15°C). Check that the power supply to the backup heater is correctly wired, the backup heater thermal protector is NOT activated and the backup heater contactors are NOT broken. Also, verify that the preferential kWh rate power supply settings and electrical connections match. If a preferential kWh rate signal was sent by the electricity company, wait for the power to return (2 hours max.).
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Angela CooperAug 20, 2025
What to do if internal wiring is damaged in Daikin Air Conditioner?
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  Lori RussellAug 20, 2025
  The damaged internal wiring has to be replaced by the manufacturer, its service agent or similarly qualified persons.
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Ryan WhiteAug 22, 2025
How to fix Daikin Heat Pump not heating enough in cold weather?
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  Johnny PottsAug 22, 2025
  To address insufficient heating at low outdoor temperatures with your Daikin Heat Pump, verify that the backup heater operation mode is enabled. Also, ensure that the thermal protector of the backup heater hasn't been activated by checking the water pressure and for air in the system. After checking these, press the reset button in the switch box.
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Diana GilmoreAug 26, 2025
Why is my Daikin Heat Pump not heating or cooling properly?
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  Andrew FosterAug 26, 2025
  If your Daikin Heat Pump isn't heating or cooling as expected, start by checking the temperature setting on the remote controller, referring to the operation manual for guidance. Also, ensure the water flow isn't too low by verifying that all shut-off valves are fully open, the water filter is clean, there's no air in the system, the water pressure is above 1 bar, the expansion vessel isn't broken, and the resistance in the water circuit isn't too high for the pump. Finally, confirm the water volume in the installation is above the minimum required value.
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youngkimAug 27, 2025
What to do if Daikin Heat Pump pump is making noise?
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  ericawrightAug 27, 2025
  If the pump in your Daikin Heat Pump is making noise (cavitation), it might be due to air in the system or low water pressure at the pump inlet. Purge air from the system or verify that the water pressure is above 1 bar, the manometer is not broken, the expansion vessel is not broken, and the pre-pressure setting of the expansion vessel is correct.
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barry07Aug 30, 2025
Why does the pressure relief valve keep opening on my Daikin Heat Pump?
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  Amanda LoweAug 30, 2025
  If the pressure relief valve on your Daikin Heat Pump opens, it could be due to a broken expansion vessel or the water volume in the installation being too high. Replace the expansion vessel or ensure the water volume in the installation is below the maximum allowed value.
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Sheryl RobinsonSep 5, 2025
Why is the water pressure relief valve leaking on my Daikin Heat Pump?
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  jonesnicholasSep 5, 2025
  If the water pressure relief valve on your Daikin Heat Pump leaks, it might be because dirt is blocking the water pressure relief valve outlet. Check whether the pressure relief valve works correctly by turning the red knob on the valve counterclockwise. If you do NOT hear a clacking sound, or if the water keeps running out of the unit, close both the water inlet and outlet shut-off valves first and then contact your dealer.
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Jason SanchezSep 7, 2025
How to fix unusual high pressure at the tapping point of Daikin Heat Pump?
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  Caitlyn HernandezSep 7, 2025
  To address temporarily high pressure at the tapping point in your Daikin Heat Pump, flush and clean the complete tank, including the piping between the pressure relief valve and the cold water inlet. If the issue persists, replace the pressure relief valve.
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Ronald GarrettSep 12, 2025
Why is my Daikin Altherma EHVH/X16S18+26CA Air Conditioner pump making noise (cavitation)?
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  Jason IngramSep 12, 2025
  If your Daikin Air Conditioner pump is making noise, it could be due to air in the system. Try purging the air manually or using the automatic air purge function. Another possible cause is low water pressure at the pump inlet. Check that the water pressure is above 1 bar, the manometer isn't broken, the expansion vessel isn't broken and the pre-pressure setting of the expansion vessel is correct.
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Susan FernandezSep 13, 2025
What to do if the pressure relief valve opens on my Daikin Altherma EHVH/X16S18+26CA Air Conditioner?
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  christine17Sep 13, 2025
  If the pressure relief valve on your Daikin Air Conditioner opens, check the temperature setting on the remote controller. Also, ensure the water flow isn't too low by verifying that all shut-off valves are completely open, the water filter is clean, and there is no air in the system. Make sure that the water pressure is >1 bar and the expansion vessel is not broken. If the problem persists, the expansion vessel may be broken and need replacement.