Type: Posts; User: snuffy collins
if it is a scroll compressor it may be internal check valve letting gas by and making it run backwards momentely.
unit is in defrost probably . fancycling switch or head psi. control does not effect a heatpump in heat mode only in cool mode .
all units are good except armstrong don't waste your time as for rest all units are going to have about same parts. go for part warr. i know for fact goodman 10yrs.on parts lifetime on...
i would want at least 3 feet of hard duct if it is gas furnace. a good sheetmetal man should make it work.
try running solid pipe 3to 4 feet and insulate seal joints good.
it post tohave built in checkvalve no noise in cool mode .
no not a motor!
yes sound like a restriction psi look ok no sudden swing unit heat ok
yes 7/8-3/8 recommend
coil squeeling in heat mode outside unit 13 seer goodman heatpump inside coil is mortex coil for mobilehome ahu. cold outside when unit comes on makes loud whistler sound maybe for 10 to30 seconds....