I have an FHP GT036 heat pump which seems to work well...was installed in a house we bougt 2 years ago. But in recent cold weather (10 degrees) it seemed to run ALL the time keeping a reasonable indoor temp of 74-75, but part of the time seemed to just put out room-temp air. We worried about the constant running of the unit, and switched the thermostat to emergency heat since our unit doesn't do that automatically. Then after the weather warmed up a bit, we switched back to the heat pump. There now seems to be no water movement into or out of the heat pump, although it still maintains the indoor temp. The outgoing water should be going to the creek or alternative faucet outside. Neither is putting out water, and the tank pressure doesn't seem to change when the heat pump is running. Unsure if the water treatment chlorinator is outputting anything to the heat pump. Suggestions or information welcome!

Sound to me like you might want to contact the installer to have them check it out. If you have the emergency heat turned off, and the unit is maintaining the house temp, the water has to be going somewhere. It's the somewhere that would have me worried. The only other thing I can come up with is if for some reason your system is still on emergency heat even though you believe you have it turned back off.

One other thought is that by turning off the water, you now have frozen drain (s).
Good luck,
j

We've since had 2 days of 55+ temps since, I would think, or hope, that would be enough to thaw any freezing issues. It seems that Eric's suggestion about actually still running on emerency heat might be right, since the pressure gauge on the well water tank doesn't indicate that it's pulling in water to the heat pump. We've checked the house for leaks and all is dry. It just seems the unit is not using any water. I will contact our service rep...it seems that without an operating heat pump, we also would be without AC when needed, although I'm still trying to learn about this system. Perhaps the thermostat and heat pump are not communicating correctly.

Thomcats,

Electric meters will spin fairly fast if the auxiliary heat is on. 

Do we know that the unit is not set on constant fan? That would make it appear to run all the time but water usage would be minimal and intermittant.
J

"but part of the time seemed to just put out room-temp air. "

Betcha that's it.

The fan running constantly would make some sense, but the fan is set on Auto, and does shut off properly when on Emergency heat. Maybe it's possible that when on heat pump setting, the fan somehow gets 'stuck' in the on position, regardless of what the thermostat shows. The electric meter doesn't seem to go exceptionally fast...but then, I've never watched it before so I don't know what I'm comparing.

Constant fan can often be selected at the appliance. Don't know what you mean by "doesn't shut off correctly on emergency heat". Another condition that can occur (particularly with closed loop) is a lock out if water temp is to low. That could cause lengthy fan cycles and room temperature air. The fix for that is Turning off power to the unit then turning it back on.
I think having a contractor out makes sense for you to help you understand your equipment. You may want to avoid reset (disconnecting power) until they come out in case this unit stores fault codes.
J