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  1. Curlybonce
    We woke up this morning to no heating and 2 error messages on the Danfoss DHP AQ air source heat pump. The messages are Com Error HP Card and Com Error Exv card. I've looked it up on the internet and it says the HP Card error message is "Communication broken between display card and heat pump card (outdoor)" and the EXV card error is "Communication broken between display card and expansion valve control card (outdoor)" We've checked both indoor and outdoor units for any loose wires but there's nothing obvious. Does anyone have any suggestions as what we could do? Thanks
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