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    Feb 25, 2010, 06:48 PM
    Heat pump troubleshooting
    Low pressure switch shuts down unit. Jumped across low pressure switch so unit will run. High pressure side is 270 psi low pressure side is 0 psi. I believe the unit is low on freon but the HVAC tech says it's a bad expansion valve ( that he replaced 2 years ago ). What do you think. George

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