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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7542
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My ducted heat pump has turned off while as I needed to

Customer Question

My ducted heat pump has turned off for a while as I needed to replace some ducting now that has been fixed the outside unit won't turn on.
I can hear it where the filter is and some of the vents are blowing out cold air the others there is nothing.
What could be wrong?
Submitted: 5 months ago.
Category: HVAC
Expert:  Phil replied 5 months ago.

Depending on how the duct you are using is insulated, the insulation can come loose and block air flow, and if soft flex duct is used in the return air the inside duct liner plastic can collapse under the suction pressure and block the air flow.

You could also have pulled some of the control wire terminals off, that is the most likely, you can inspect for that.