Question about Heating & Cooling
That's normal you are hearing the reversing valve shift when it comes out of defrost.
Posted on Dec 17, 2016
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Posted on Jan 02, 2017
Well you may want to have a tech come out and check the freon level, but mostly when going into defrost, some units make alot of noise, the freon is reversed in the unit by way of the reversing valve, it makes a whooshing sound like freon is draining off, as far as the knocking noise, could be as I said in the beginning, might be low on freon, but it could be that, this particular unit does this, I have had units make some really strange noises in the past but functioned perfectly, hope this helped, please let us know, thanks again,
Posted on Jan 24, 2009
I am pretty sure you have a low charge and the pressure switch is kicking it off. probably just a pound or two however the accumulater will sometimes hold more.
Posted on Mar 31, 2009
if your heat strips are not coming on, then there are a few things to check.
The first one would be that the heat strips are actually working. The easiest way to complete this task is to turn the system on into emergency heat and turn the thermostat up. If you get heat accompanied by the traditional strip heat burnt smell, then you know the electric heat strips are working.
The second thing would be that the air handler is receiving a command for heat during defrost cycle. If the command is present with no heat, then you most likely have either a wiring issue or a failed electrical relay or contactor.
The third thing would be the defrost board itself, for it is the component that calls for electric heat strips to come on during a defrost cycle. You may or may not be able to force the defrost board into a defrost cycle and then check that the heat strips are on or not.
It sounds as though your defrost board is bad with the symptoms you are describing.
Posted on Jan 14, 2010
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