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  1. #1
    Join Date
    Jan 2017
    Location
    uk
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    Ecodan - low supply temperature

    Good morning. My first post. I am a retired Chartered engineer.
    We have a 7 year old ecodan with underfloor heating. It runs only at night on off peak electricity, and heats the house to 21C except when external ambient falls below-3C (when we run it a little longer in the day). The house loses 1-2C during the day. By observation, the supply and return temperatures differ by about 6C, eg supply 32C, return 26C. All good for 6 years until now.
    We had refrigerant leak last year (cracked pipe), which was brazed by the local well respected firm, and the system re-charged. All good.
    Lately system output has been falling though everything seems to be working normally at the outside unit. No error codes or leaks. Technician has this week confirmed a full refrigerant charge. Difference between supply and return is about 4C, so that by running non stop we can maintain but not increase internal ambient temp.Maximum supply temp now seems to be 28C at 6C external ambient - we used to see 34C at this external ambient.
    Hot water set point is 58C. System used to achieve this easily in two programmed time slots which interrupt the heating mode. However, in hot water mode, supply temp does not exceed 50C.
    Something is clearly wrong, but we are stumped as to cause. Any advice would be much appreciated
    Last edited by halfpenny; 07-01-2017 at 11:15 AM. Reason: more info

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