Slightly Stop

Benlee17

My Lennox heat pump system slightly stop before reaching the preset temperature.

Slightly Stop is defined as: the system starts running and then slows down, air output becomes less and less or not output, before system reaching the preset temperature. Actually , the system doesn't completely stop, rather then restarts and get running smoothly through whole day. This cycle might happen once or twice, but never more than three times.

The start capacitor was replaced one year ago.

Any advice appreciated.

Thanks a lot!

mattmia2

defrost?

pecmsg

Model # would help.

Is this a central or mini split Heat Pump?

Benlee17

The system is Lennox with model number: CBX32MV-036-230-6-05.

The system is working very well except for the Slightly Stop, which doesn't sound normal or smooth to me.

Thanks

pecmsg

is this a communicating system?

Benlee17

It is a Lennox Signature heat pump. I don't know if it is the communicating system. Sorry.

ratio

That is a communicating indoor unit. Paired with a communicating outdoor unit and communicating thermostat, it should be able to modulate the outdoor unit and indoor fan speed to better match the heating or cooling load of the house.

Sounds like it's working to me. When it does its slightly stop thing, are you recovering from a setback (set the temperatures down at night and higher during the day)?

Benlee17

Thank you, Ratio,

I do the setback (lower temperature at night time and higher temperatures during day time).

The Slightly Stop happens during a cycle ( from one temperature to another temperature, such as from 18C to 19C). The system slows down, but not completely stop, and then comes back to its full speed before reaching 19C . It might happen once or twice during a cycle. It might not happen at all.

The Slightly Stop sounds like the system has an overload at full speed, and then disloading during slow down. I am afraid if any parts fail (becomes weak).

Thanks again.

ratio

Without actually being able to look at or measure operation, I'm just guessing; but it still sounds like fairly normal operation. Occasionally, the system throttles down when it approaches setpoint (normal), then starts to undershoot (not optimal but not unreasonable, occasionally), so it ramps back up to reach setpoint, & then modulates happily. There may be some settings that can be altered to make that less likely, but that would take some experience with that setup.

If you're still concerned, try the "Find a Contractor" link in the blue bar at the top of this page.

Benlee17

Thank you very much, fellow.