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Old 10-25-2013, 11:06 AM   #16
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Help Heatpump freezing


Something caused the high pressure switch to trip. You have a problem that is most likely not the defrost board. Unless you were running it in cooling mode.

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Old 10-25-2013, 11:08 AM   #17
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So I wonder what can cause it to trip the high pressure switch in the heat mode? I know how it happens in cooling. Do those reversing valves ever get stuck between heat and cool?

You have a serious problem now if it tripped the high pressure cutout.
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Old 10-25-2013, 01:53 PM   #18
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I only get freezing when it's in heating mode (in Winter).
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Old 10-25-2013, 02:42 PM   #19
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you have a serious problem which will require a experienced tech to put his gauges on to troubleshoot. not something that can be done over the internet. for it to trip a high pressure cutout you would need a major blockage in the Freon lines which causes it to build up excess pressure. that may happen intermittently so he may not find it when he is there. with that age of unit I would recommend a new higher efficiency one as the repair is going to be very expensive. that is a very unusual problem. you have to decide when it is time to not throw good $$ into a worn out 20 yr old car or not.
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Old 10-25-2013, 03:09 PM   #20
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To freeze as heavy as the pic, the unit was cooling, not heating. So the electrical needs to be checked.
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Old 10-25-2013, 11:46 PM   #21
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I am betting its a problem with the reversing valve not releasing when the unit is switching out of defrost.
Only way to freeze the indoor coil is with AC running. A bad defrost sensor would cause the condenser to freeze.
I would suspect the board is still sending a signal to the reversing valve when it kicks out of defrost. It could be the reversing valve hanging up though.
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Old 10-25-2013, 11:50 PM   #22
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I just read the rest of the post after posting. I agree with the above. You need a tech. Sounds like a blockage

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Old 10-26-2013, 01:06 PM   #23
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Quote:
Originally Posted by beenthere View Post
To freeze as heavy as the pic, the unit was cooling, not heating. So the electrical needs to be checked.
What electrical?


So I kept checking the volt meter and it does go to 0V. So the board is good? It is something stuck in the freon... So that means if they are going to fix it, they need to replace ALL the freon? + vacume test to check for leaks and clean the lines. So I'm looking at 1,500$ easy...

I'll wait to see if it's going to freeze up again, if it does I'll be shopping for a new unit. Any recommendations? Carrier? and which brands to STAY AWAY from?
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Old 10-26-2013, 01:14 PM   #24
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One brand is pretty much the same as the other.

Could still be a wiring or control issue.
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Old 10-28-2013, 12:17 PM   #25
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Ever since I have switched the defrost timer from 60min to 90min it has not frozen... It has not been cold yet but I'd rather not touch it.
Maybe it is not staying on for over 90 minutes to warm up the house so it's never going into the defrost cycle. Tonight and tomorrow night it will be very cold and the system will work hard. I don't want to touch it before letting it work.

I'll keep you posted.

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