Heat pump heating beyond target

[CopperSubstrate]

Our home has many Mitsubishi heat pumps. I've installed the integration on all of them, replacing the prior integration.

Recently as it has become cold I've noticed an issue. Our largest unit, a Mitsubishi MSZ-GL18NA-U1 (the only unit which has vertical and horizontal swing modes), will sometimes continue to heat past the heat target set in the integration, and the integration will report that it's not heating. Logs show the heat climbing past the target but do not show the unit as actively heating.

[phidauex]

Hmm, that is odd. It could be intended operation, I've noticed they do have some hysteresis and will sometimes overshoot a bit in order to run a longer cycle. It could also be bleedover if you have multiple heads on the same outdoor unit - if other units are still heating, then hot refrigerant is still run through the "off" head, in order to keep oil from pooling. This can cause them to put out some heat even if the unit is trying to be off.

What do the LEDs on the front say when it is doing this?

[CopperSubstrate]

Hmm, that is odd. It could be intended operation, I've noticed they do have some hysteresis and will sometimes overshoot a bit in order to run a longer cycle. It could also be bleedover if you have multiple heads on the same outdoor unit - if other units are still heating, then hot refrigerant is still run through the "off" head, in order to keep oil from pooling. This can cause them to put out some heat even if the unit is trying to be off.

What do the LEDs on the front say when it is doing this?

It was the usual light pattern - only the top light on and solid.

[CopperSubstrate]

I'm seeing this issue again with a different unit. This one definitely has both lights illuminated.