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problem with carrier heat pump
does anyone know if the txv used on a carrier air handler model# fk4dnb006 has a internal check valve? i worked on one today matched with a 38ykc048 heat pump that works fine in the cooling mode,but when it is in the heating mode it immediately (within 30 seconds) freezes at the piston body,and the distributor on the outdoor unit.all four tubes that come off the outdoor distibutor freeze to the same degree.the only thing that i can think of would be a stuck (closed) check valve at air handler. that would explain why it operates fine in the cooling mode.the unit will go into defrost,but by that time there is so much ice on the outdoor coil it times out before all the ice can clear the coil. any thoughts or suggestions would be much appreciated. thank you