# Mitsu Zubadan Flow Temperature Issue **URL:** \ **Category:** Heatpump\ **Tags:** mitsubishi, zubadan\ **Created:** [6 January 2026 14:57 UTC](https://community.openenergymonitor.org/t/mitsu-zubadan-flow-temperature-issue/29576 "2026-01-06T14:57:35Z")\ **Posts on this page:** 1\ **Showing post:** 24
**Author:** ![Timbones](https://community.openenergymonitor.org/user_avatar/community.openenergymonitor.org/timbones/32/20308_2.png) [@Timbones](https://community.openenergymonitor.org/u/Timbones)\ **Post date:** [9 January 2026 17:49 UTC](https://community.openenergymonitor.org/t/mitsu-zubadan-flow-temperature-issue/29576/24 "2026-01-09T17:49:10Z")
> [@bontwoody](#): > > However in Auto Adapt mode this can be increased to 5C and so the flow stabilises. Anecdotally, many Ecodan owners find that Auto Adapt mode does work considerably better than other modes. It may take a couple weeks for it to fully learn the behaviour of the property. Do you know what speed the primary pump is set too? This is a 1 - 5 setting on the FTC, and can be different for heating vs. DHW. COP of 1.75 is still very poor though, so AA may be hiding a systematic issue or the temperature sensors are giving bad data. Given that the internal temperature is stable, the latter seems more likely. The 3.8 kW being generated by the heat pump is way below the minimum for a 12 kW unit; I’d expect it to be somewhere around 6 kW (matching the heat loss with a COP of 3). Do you know the exact model of the outdoor unit? See this topic for correct [Temperature Sensor Placement on Ecodan Cylinder](https://community.openenergymonitor.org/t/temperature-sensor-placement-on-ecodan-cylinder/22435) - they should ideally be fitted tight to the pipe with thermal paste, and then covered with insulation. (These pre-plumbed cylinders have soldered brackets for the probes to slot into). --- _[View the full topic](https://community.openenergymonitor.org/t/mitsu-zubadan-flow-temperature-issue/29576)._