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Help Please! Heat pump freezing???

post #1 of 20
Thread Starter 
Seems to be a problem, I've never heard of for heat

I haven't seen it yet, happened the last couple of days... according to Jenny... this morning she took a couple pics, then I added a couple showing brand, and water after it defrosted.

Quote:
two bands of frost around the unit, heavier coating of frost than in pictures. runs constantly at night. when thermo is turned past current temp and unit turns off the frost goes away fairly quickly. at one point it sort of "popped" and smoke (right much) or steam came up from the unit


Jenny


It's only been low-mid 40's here at night so far, getting lots colder this coming week. Have 2 returns in the house, checked both filters today, could be replaced, but don't seem that dirty. Strange thing, from the amount of air flow coming out the house vents, there seems to be "Very little" pull of air from the returns, I would think it would be quite noticeable, like hold the filter in while running, but hard to tell it's even pulling air??? Unit is 3-5 years old max (whole house conversion), and I know nothing of heat pumps

Most of you know we have only been here since June, and the unexpected problems are really taking their toll

Any ideas would really be appreciated!

Wes...

Pics........







Water from defrosting, a couple hours after the unit was turned off...
post #2 of 20
Shut it down at thermostat only. Do not open breaker so the crackcase heater can still remain availabe as I do not know temp. there overnight.

Let it thaw and melt until your tech. gets there. With that ice on the coil he will not be able to take any reliable pressure readings and you will pay him to wait around until it melts...otherwise get a bucket and slowly pour water on the outside unit with the power completely off!

You are most likely low on refrigerant, why , how??, that is the 450$ question. Find the leak or keep adding.

Good luck, hope you/they find the leak quickly, say at the outside unit.
post #3 of 20
Thread Starter 
Quote:
Originally Posted by EJM
Shut it down at thermostat only. Do not open breaker so the crackcase heater can still remain availabe as I do not know temp. there overnight.


The temp at nights have neen low 40's...

It's been fine this summer with the AC running (nice and cold), it's now that the "Heat" is running, that it is freezing up
post #4 of 20
are the cooling fins dirty?

that makes a huge difference with dehumidifiers
post #5 of 20
Thread Starter 
Fins are clean, actually I get accused of being "too" anal in keeping them that way
post #6 of 20
Frost on a heatpumps outdoor section is normal.

The outdoor coil runs a temp about 15° colder than the ambient temperature and if the outdoor temperature is below the coils dew point the moisture in the air will condense on the coil and it will freeze.

The smoke (actually steam) is normal, it’s the unit going though a defrost cycle.

If the system is maintaining temperature in the house, good chance it’s OK. If it’s running a lot and not cycling off chances are it’s not OK. If it has ice on it all the time chances are it’s not OK.

If in doubt, call the guy .
post #7 of 20
Thread Starter 
Last night it went to 34 degrees outside. Thermostat set at 70. Heat Pump was running all night, and was 67 inside when we awoke at 6am, so temp actually dropped 3 degrees. Outside pump fins were "all" totally covered in frost!

Help! (if you can)

Thank You!

Wes...
post #8 of 20
My heating/AC guy will be here tomorrow installing a new furnace for me. I'll show him this post and see if I can get an answer for you.
post #9 of 20
Heat pumps have a type of reversing valve if I'm not mistaken. (it's been a while since I studied HVAC) The valve switches the flow of refrigerant to make your evaporator change to a condenser and vice versa. Sounds to me like your valve is stuck on AC.
post #10 of 20
Thread Starter 
Quote:
Originally Posted by Fishnfella
My heating/AC guy will be here tomorrow installing a new furnace for me. I'll show him this post and see if I can get an answer for you.


That would be awesome, Thank You!

Wes...
post #11 of 20
Thread Starter 
Quote:
Originally Posted by Fishnfella
My heating/AC guy will be here tomorrow installing a new furnace for me. I'll show him this post and see if I can get an answer for you.


Just wondering if you had a chance to ask, took off the cover, cleaned and made sure all fins clean and clear of debi, still having the problem with nights just in the 50's

Thanks,

Wes...
post #12 of 20
If your having problems with temps only in the 50's call the guy, it's broke.
post #13 of 20
The outdoor coil will freeze in the colder weather. There is a defrost board in that unit that can be set for 30/60/90 minutes to attempt to defrost the outdoor unit. looking at the way it is icing I believe you are low on Ref charge since the coil is not icing completely and only in thin strips the refrigerent charge is more critical in the heat cycle than the air cond cycle. You should get your hvac service person to come checkout the system and adjust the charge and or check for a plugged piston or bad expansion valve in the outdoor unit.Continueing to run the unit that way is going to cost you far more in electric bills due to not maintaning temp and cycling on the electric backup heat to supplement the heatpump
post #14 of 20
Welcome Dawg.

get a neighbor or someone nearby you to put a set of gauges on there and get a pressure/temperature reading so you have an idea whats going on.

would just ask a tech. wherever, if they could give you a minute or two of their time to put gauges on. Around here, that would not be a problem. It would take all of 5 minutes. Throw him a crispy buck or 2 ......
post #15 of 20
My money's on low refrigerant. Saw the same thing many times at an apt complex I used to work at
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